This can be the same as the line voltage, however often a lower voltage is selected for the contactor for safety purposes The amp probably has a bad SILICON DIODE. Calculate Size of Contactor, Fuse, C.B, O/L of DOL Starter Calculate Size of each Part of DOL starter for The System Voltage 415V ,5HP Three Phase House hold Application Induction Motor ,Code A, Motor efficiency 80%,Motor RPM 750 ,Power Factor 0.8 , Overload Relay of Starter is Put before Motor. 3 amp fuse blowing on air handler board....narrowed it down. Checked contactor and it was burned. (See manufacturing data) Stock 70 amp contactor Performance 200Amp Contactor Stock 70 amp contactor Performance 200Amp Contactor Stock OEM 100 amp contactor The valve amp was blowing a fuse every time the standby switch was turned on. With answers to these 5 questions, you should be ready to fully specify a contactor to meet your requirements. I have read that this is often caused by the pump or fan. The issue, I assume line one (farthest left bank in the breaker) is consistently blowing the fuse after the compressor runs for half a day or so. Technician. For example, you could use a NEMA Size 5 contactor to … What is causing the fuse to blow? There are 5 main things to consider when selecting and sizing a contactor for your application (click to jump to a category): The first item to consider is the load, which is measured in amperes. Took off cannon plug and jumped a/b. A good idea but depends what the instructions say. The 3 amp fuse has blown today in the spur supplying it. - the F3 4 amp fuse keeps blowing - the T3 Resistor looks bad (see pic) So could the T3 Resistor (if bad) cause the F3 to blow? Discussion in 'Plumbers' Talk' started by Matt Vernon, Nov 12, 2016. CompStudio 10Pcs/lot T3AL250V 3A Slow Blow Fuse 5x20mm 250V 3 Amp Glass Tube Fuse Time Delay Fuse (3/16 in x 3/4 in) 4.2 out of 5 stars 13. current rating (i.e. we have had problems with the 3 amp fuse tripping but only when the heating is on it doesn't do it when the hot water is on.we had a plumber/electrician come and he replaced the valve,thermostat,hot water and heating controls and the box with all the wiring in . 1 #2 7 years ago JEF. Below is a chart of the utilization categories for IEC contactors. This turned out to be true. Blowing Low Voltage Fuse Breaker Trip | Control Wiring Troubleshooting - I’ve got a 5 amp fuse that keeps popping on a circuit board. Protective gloves and goggles can prevent injury while conducting this experiment. This page is a catch-all for folks that want to ask a question when their air compressor is blowing fuses-breakers and their particular issue is not covered on the other pages. I replaced it and everything worked fine. $7.99 $ … Ask Your Own HVAC Question. I did some researching and found out it was the 3A fuse. If you were to put a 4 amp 50 volt time-delay fuse in it's place, you would still provide short-circuit protection while bypassing this slight(ish) problem. $7.99 $ 7. Hey, I have exhausted my troublshooting ability...I need some direction. 6 years college. This load amperage is the amount of current required to power your device at the line voltage. Reactions: birddoctor , Jeff B , BigJim55 and 1 other person Everything is working as it should. Only 4 left in stock - order soon. In previous blog posts, we talked about the differences between IEC vs. NEMA and discussed the basics of a motor starter. (See manufacturing data) Stock 70 amp contactor Performance 200Amp Contactor Stock 70 amp contactor Performance 200Amp Contactor Stock OEM 100 amp contactor Heaters, Squirrel-cage motors:  starting, switching off motors during running time, Squirrel-cage motors: starting, plugging, inching, slightly inductive loads in household appliances: eg. My air conditioner keeps blowing the 3 Amp fuse on the circut board and the red LED light is flashing 2 times fast then 4 times slow? This can be a good way to teach how circuits, voltages, and amps work. I am still popping fuses and reading over 24 volts. Thanks for the help. in the Gas Engineers Forum area at PlumbersForums.net. 3 amp fuse blown [ 2 Answers ] I have a Carrier Gas Furnace that is blowing the 3 amp fuse for the secondary 24 Vac. Hello everyone, I've used some advice from previous threads to get me as far as I am with this issue, but I'm stuck again. Status Not open for further replies. Choose your motor horsepower, input voltage and single or 3 phase from the drop downs and the calculated full load amperage is displayed. Send help. I replaced it and it blew again immediately. My 3 amp fuse is blowing on the circuit board. Choosing the right utilization code will extend the life of the contactor. Blowing 3.2 fustat, instead of wasting fuses coverted to 3 amp breaker. You should next confirm the control voltage to be used to power the contactor. A new fuse was put in and this also blew. Adding additional contacts to a contactor is inexpensive and could save you time and money if you take the time to review the operation as a whole. A good example for using auxiliary contacts would be turning on a pilot light to indicate the motor is running. Matt Vernon New Member. This can be the same as the line voltage, however often a lower voltage is selected for the contactor for safety purposes. apparently no shorts on low or high voltage side. (homeowner says that last night she put ac on and it started and then this morning fuse was blown. Generally, coil voltages are 250V or below. series motors). 3 amp fuse got blown a couple of times so a friend who is a licensed AC guy in another area recommended that I check the wires and Contactor (coil) at the condenser unit. (Bingo, the old one is drawing too much current and blowing the fuse.) So, I went to start it yesterday, and nothing. Lights working again. Weak with electric and weak using meter. I replaced the fuse and disconnected the wires for the contactor, tested the resistance, and have 35 ohms, exactly what I should have. Central heating blowing 3A fuse. First thought was change the fuse, which I have this time for a 3 amp. Another consideration is whether the motor operation requires reversing of the direction, in which case a reversing contactor would be required. 3 amp boiler fuse. - although I dont know why it would have blown. Thanks!!! Only 8 left in stock - order soon. Fans, central vacuum, Hermetic refirgerant compressor motor control with manual resetting overloads, Hermetic refirgerant compressor motor control with automatic resetting overloads, Control of resistive loads and solid state loads with opto-coupler isolation, Control of solid state loads with transformer isolation, Connecting and disconnecting under no-load conditions, Switching of resistive loads; including moderate overloads, Switching of mixed resistive & inductive loads, including moderate overloads, Switching of motor loads or other highly inductive loads, Protection of circuits, with no rated short-time withstand current, Protection of circuits, with a rated short-time withstand current, Non Inductive or slightly inductive loads, resistance furnaces, heaters, Shunt-motors, starting, plugging(1), inching(2), dynamic braking of motors, Series-motors, starting, plugging(1), inching(2), dynamic braking of motors, Control of D.C. electromagnetic loads having economy resistors in the circuit, Switching of resistive loads, including moderate overloads, Switching of mixed resistive and inductive loads, including moderate overloads (i.e. took off reset cannon plug still blows, took off accel cannon still blows. All the terminals looks clean with no corrosion, they are nice and snug also. There are two main types of fuses: cylindrical and plug fuses. Can anyone tell me what the specification is? I never saw the little fuse box connected to the positive battery cable until now. All rights reserved. Show More. Contactor Coil Voltage . I went a head and replaced it. of Poles 3, Reversing: No, 9 Full Load Amps-Inductive (3DY20)? I also found several pinched wires as well. Customers who bought this item also bought. I... Old Wylex 5 amp wire fuse upgrade to Mini trip switch 6 amp fuse. Power is ran through a 240v 3 phase 60 amp breaker, currently the breaker is running 50 amp fuses. Our boiler has no fan so I presume it is the pump. The 3A fuse on a furnace circuit board can keeps blowing because of a faulty transformer or damaged thermostat wiring. Replaced contactor and 3 amp fuse and still blowing fuse. 1. If you have a gas-fired furnace, disregard this. Help! The contactors can be coupled with the following fuses: – V7 with fuses from 6 A to 450 A (up to 315 A for motor protection; up to 450 A for capacitor bank protection) – V12 with fuses from 6 A to 200 A. PowerCube series unit. BRYANT Furnace blowing 3-amp fuse on control board [ 1 Answers ] I have a Bryant M/N 383KAV036070AGJA, S/N 3097A08913, Series G furnace with central air that is blowing the 3-amp fuse on the control board. Share this conversation. Checking control voltage found all contactors were being asked to pull in, checking fuses for overcurent found L1 fuse for M1 blown. ... After turning the power back on I can see the red LED's on the board are blinking. Basic Calculation of Motor Torque… I do not know if the fuse blew during operation, shutdown, or when the next request for cool happened. 0. An incorrectly specified IEC contactor may work for a period of time, but the lifespan will be severely reduced. Show Less. 3 amp fuse blowing on air handler board....narrowed it down to red wire out to heat pump.... red wire traces directly over to defrost board...I see a little discoloration on two resistors on the board … read more. $19.25. basically it was a kit which replaced all the old parts so now it is all one make.but it was working fine but now has started to … Worn and/or Faulty Parts. Model #CB29M-41-2P AIR HANDLER. the current the contactor can safely disconnect) is rated as 75amps, but with higher temperatures, this rating is obviously reduced with plain copper contacts. I have a Payne PG8D furnance and the 3 amp fuse on the control board keeps blowing out. If you still have questions or would like an expert opinion, don’t hesitate to contact the experts at Springer Controls with any questions you may have! The issues we are having is the 3amp fuse keeps popping. 1. Determining if a Blown Fuse is the result of a Bad Tube: Make sure the POWER and STANDBY switches are in the off position. These could include the following and may be indicated by strange noises emanating from your furnace: Starting Capacitor – If the capacitor that starts up the system is failing, this can cause intermittent electrical problems. Furnace is giving me a 24 code. Compstudio 10Pcs F12AL250V 6X30MM 12A Fast Blow Fuse 12 Amp 250V F12AL Glass Fuse Fast-Acting Fuse (1/4" x 1-1/4") 3.5 out of 5 stars 2. This is what blows a fuse. If a motor will be jogged or have frequent stop/starts, then it should be accounted for by choosing a slightly larger contactor. Heating & Air Conditioning Contractor. I have checked all leads/cables in the airing cupbaord are not pinched/uninsualted and there are no water leaks evdient. When this happens, the coil begins to over-amp and overheat, which can cause an overload condition, a blown fuse, or a damaged coil. Blown 3 Amp Fuse in AC quick fix - Save $300-$500 - YouTube After a while the A/C turned off. Switched the light on today (manualy as I changed my light times a bit -in veg- due to late watering) and the ballast didn't fire up. Blows the 3 amp fuse on the control board for my Goodman AC unit. I have a furnace/coil that for the past 3 years has been blowing the 3 amp fuse on the board 2-3 times an entire heating season. If the wiring is shorted, the contactor is stuck or the contactor coil is bad, this could cause the fuse to blow. M2, M3 and M4 were running ok. With blown fuse still installed checking from line side of fuse L1 and load side of fuse L1 for M1, I get 480 volts? I'm far from an electrical expert so Check the transformer for any faults. If you went through this test and it suggests a bad tube, continue on to locate the bad one: Testing Rectifier Tubes (5U4, 5AR4, 5Y3): TRANE Replacement Time Delay Fuse, Single Element, 300 VAC, 3.2 AMP, 24V Control - Box of (5) $21.95. Motors are what we call “inductive” loads, meaning there is an induced voltage due to the rotational effects of the motor. So I replaced the fuse, put the panel back on, and it didn't turn on. Blower Motor – A failing blower motor draws too much power and may cause a short. Well tonight, randomly, the ac shut off. Next. So I went and checked the fuse.. and it was blown. DIY and save $300-$500. The unit fired RIGHT up and ran solid for about 5 minutes .... then blew the fuse again. You should next confirm the control voltage to be used to power the contactor. I have replaced the control board, contactor and the transformer. L3 fuse is good. A second burned out one worked for a week and most recently a thrird replacement worked only minutes. hi all, after a bit of advice. 99 ($1.60/Item) FREE Shipping. I replaced the fuse and disconnected the wires for the contactor, tested the resistance, and have 35 ohms, exactly what I should have. For example, if you have two applications, both using the exact same motor, but in one case the motor will simply be turned on for long periods of time, while the other will be turned on/off constantly, you will likely use two different IEC contactors for each application. This is significant difference. Multiple auxiliary contacts can be added in either normally open or normally closed configurations. Quick way to find out why our Low voltage fuse is blown .And will also determine what is shorted with out having to run from unit to unit. Took the panel off, and the fuse was blown again. This was done after I couldn't get an appointment soon enough for an AC repair person to come and check out when my AC is dead. (If NO, and the fuse has blown again. The 5 amp fuse on my control board blows as soon as you ask for heat. What is my next step? 3. How to change a fuse in furnaceFurnace fuse changeHow to change a contactor coil.Blown Furnace FuseGoodman furnace won't startFurnace won't startFurnace low voltage shortAC fuse shortGoodman furnace fuse repairGoodman Furnace fuse shortCircuit board in AC keeps blowingNo heat low voltage shortFurnace blowing low voltage fuseVoltage fuse burnAC won't turn onCircuit board in AC keeps shorting Also Calculate Size of Overload Relay if O/L Relay Put in the wingdings (overload is placed after the Winding Split into main and delta… Copryright © 2021 Springer Controls Company ®. I have a carrier cental air unit that keeps blowing 5 amp fuses. I have a Goodmand Heat Pump Package Unit M#GPH1342M41AC unit is about 7 months old. If YES, then the amp is likely okay, and you simply have a bad tube! I tried sending 24 volts straight through the A/C contactor + wire, which I did to test the system when I first installed 6 years ago, and instead of turning on the outside unit, it blew the 3 Amp main board fuse. The 100A fuse is clearly blown but I havent a clue how to remove it. Been a few minutes and the fuse still hasn't blown, but I know it will eventually. ; Inspect the tube sockets - make sure there are NO burn marks (any burn marks must be removed before the amp … Grainger's got your back. I did and found out it was burned. Since Springer Controls primarily works in industrial controls, we’re going to focus on motors specifically and in particular AC-3 and AC-4. I replaced the fuse and used the thermostat to turn the fan on followed by the heater then the A/C. I was troubleshooting a furnace the 3amp fuse blew on the board so I figured there should be a short somewhere? Proceed with caution, as some fuses can explode when they are blown. Looking for SCHNEIDER ELECTRIC 120V AC IEC Magnetic Contactor; No. FREE Shipping. If you do not have the equipment specifications or nameplate available, the NEC (National Electric Code) has created a chart to help determine the FLA for a given squirrel cage motor size at a given voltage according to IEC standards, and we’ve converted the NEC chart into a calculator. Now even a 5 amp fuse blows when system starts. I measured the electrical resistance on low voltage side of the contactor and it is only 2.3 ohms. 1,793 satisfied customers. The fuse would blow when the unit shut down after a cycle or two, that suspect me to check anything that’s working at the end of the heating cycle. Calculate Size of each Part of Star-Delta starter for 10HP, 415 Volt Three Phase Induction Motor having Non Inductive Type Load, Code A, Motor efficiency 80%, Motor RPM 600, Power Factor 0.8. Unless I am missing something, at 2.3 ohms it would draw more power than a 3 amp fuse can provide. HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 10 years ago. I have Lennox ac system and the fuse #3 amp in blue wire keeps blowing. I have a carrier cental air unit that keeps blowing 5 amp fuses. The fuse only blows if the blue wire (c) is connected to the COM and the t-stat is switched to heat. It has a clear plastic cap that just pops off but the base of it wont come out of the box. Can you help? If jumped system would start and function fine. TRANE Replacement Time Delay Fuse, Single Element, 300 VAC, 3.2 AMP, 24V Control - Pack of (2) $11.80. Anyway, in March, the 3 amp fuse on the internal board in the furnace blew....the system was installed 2 years ago, and I didn't hink much of it. If excess current flows through the fuse, the metal strip will heat to its melting point and break. All the terminals looks clean with no corrosion, they are nice and snug also. A valve amp blowing fuses can be a number of things, but in this case I suspected that the amp probably had a faulty power valve. Current can be defined as a count of the number of electrons running through a circuit. Where should I start my search? $7.99 $ 7. I checked each and every wire in the bundle and found a slit in the pink wire that comes from the HPS to the DFC-board. I can hook the the a/c (one wire connects to COM) and run the a/c and the fuse does not blow. How long have you been dealing with this? Today we’re going to talk about selecting a contactor for your application requirements. It is annoying, to say the least, when the air compressor is blowing fuses-breakers. Springer Controls sizes our contactors for 10 million operations to ensure long life. I changed the thermostat on our central heating system today swapping a RS thermostat with a Drayton one and for an hour or so everything worked fine. The unit runs ok for a few days and presto the fuse popped again. Generally speaking with motors and other industrial equipment, you want to look at the nameplate to confirm the input voltage and the Full Load Amperage (FLA). The motor that will be turned on/off constantly will require higher current loads and thus require a larger contactor. The most common mistake we see is incorrectly choosing AC-3 when AC-4 would be more appropriate, resulting in a shorter lifespan of the contactor. Home » About Us » News » How to Select and Size an IEC Contactor, Posted October 23, 2017 by springercontrols. Contractor's Assistant: I'll do all I can to help. M. mickshields. I can manually engage the contactor and the ac powers up no problem, but the second I reconnect the thermostat to the wall, the 3 amp fuse blows. … read more Obtain a fuse. Steps. V=IR, or so I always thought. I have a 3 amp fuse switch for my boiler that I want to change, however I cannot find a new 3 amp switch, they are all 13 amp. Use it for guidance, but please always refer to the equipment nameplate for the specific information whenever possible as the FLA can vary greatly due to a variety of factors. 3 amp fuse keeps blowing everytime I reconnect the thermostat. Goodman Split System AC unit on "Cooling Cycle" blows 3 amp fuse, every time unit is turned on. IEC uses utilization categories, or “codes”, to describe specifically the type of electrical load and duty cycle of the load(s). Any ideas on what connectors to image-235.jpg image.jpg unplug on the power driver board or other areas to test the boot up? … mask,front desk still blows. The unit was off and the 3 amp fuse was blown. Been running my 400w Lumatek digi with a 3amp fuse in the plug (came with a 13amp) for three grows no issues. Those part numbers are LVU 804171 for the 1.5 Amp diode. The NEMA selection process always results in a choice of a contactor you can use over a broad range of operating conditions. BillyHvac, Journeyman HVAC Tech. Witonics 12A 250V Fast Blow Glass Fuses 6x30mm (Pack of 5) 5.0 out of 5 stars 5. With a good fuse in the AC work fine and you can switch the fan from Auto to Fan on with no problem. The furnace has been serviced numerous times over the past two years for various problems by multiple service companies. Answered in 7 minutes by: 6/21/2009. Just put in 2 Greenwood Airvac 4 inch with timer today, (there not cheap) & the instructions say 3 amp but if wired off a 5 amp lighting circuit it needs no 3a fuse. Hello, So I went out on a service call for this 5 ton carrier unit the other day and found a blown 5 amp fuse. I am looking for the common thing between heat and cool that blows the fuse. 3 Amp Fuse Blowing I was wondering if anyone could help me out here. Part number for the 3.0 amp diode is LVU801850. I replace the T-Stat wire from the stat to the unit, to ensure that the fuse was not tripping due to a pinched wire. Since P is based on your devices power requirements, it will remain constant, if you lower the voltage, the current must increase to balance the equation, and vice versa. Mixers, blenders, Motor-loads for household appliances: eg. shunt motors), Switching of highly inductive loads (i.e. The replaced fuse worked for 2 months. However blows as soon as you turn on pinsetter. I let the unit run the A/C. 2 days. Choose your motor horsepower, input voltage and single or 3 phase from the drop downs and the calculated full load amperage is displayed. Cylindrical fuses consist … Category: HVAC. I (or A) is the electric current in amperes, and V is the voltage. Power is ran through a 240v 3 phase 60 amp breaker, currently the breaker is running 50 amp fuses. Please advise on how to troubleshoot problem.Thanks The fuse is fine when i disconnect the wires at the coil, and to confuse things more, when I take the 230VAC away from the AC unit (from the AC breaker or the outdoor access panel) the fuse is fine. Vocational, Technical or Trade School. They make resettable fuses in 3 and 5 amps called poppers. the current the contactor can safely disconnect) is rated as 75amps, but with higher temperatures, this rating is obviously reduced with plain copper contacts. Get it as soon as Wed, Jan 20. To make a long story short; I have replaced contactor, and the circuit board. Method 1 of 2: Part I: Assembling Your Materials. Easy online ordering for the ones who get it done along with 24/7 customer service, free technical support & more. I took off all the wires of the dummy board and jumped out r & W furnace turned on fine but as soon as I put on the wires for the condensor on Y & C fuse blew again I checked the 2wire running … UniMotor series enclosure. I replaced the fuse to see if it would blow open again but it didn't. ... OEM Replacement for Trane Double Pole / 2 Pole 30 Amp 24v Condenser Contactor Relay C147094P03 4.8 out of 5 stars 22. A reversing contactor is an assembly of two contactors (one for each direction) joined by a mechanical and/or electrical interlock to ensure only one contactor is energized at a time. Gaztech. Satisfied Customers: … We see this on occasion with contactors that become stuck in the open position due to corrosion or objects becoming stuck in the contact points. The voltage out of the transformer reads 26.3 volts. I checked the fuse, and sure enough, its blown. 3A Fuse on Circuit Board Keeps Blowing. Motor Full Load Amps Calculator. Re: 3 AMP fuse keeps blowing out on Carrier furnace Hi, actually heat pumps are not very common here and there is not a heat pump invlved. This problem, although minor, must be fixed by a tech). Price $116.68. Page 1 of 1 Start over Page 1 of 1 . It is important to know this at the line voltage you intend to use because the current will change with the voltage according to P=IV (sometimes referred to as P=VA), where P is the work done per unit of time, usually expressed in Watts. Non-inductive or slightly inductive loads, eg. Auxiliary contacts allow additional operations to take place when the contactor is energized. It's getting cold out tonight. Every furnace circuit board has an inducer and if it is faulty it can cause a fuse to keep blow continuously. So, a few months ago my AC wouldn't kick on nor the fan or furnace. 12,723 satisfied customers. James. I tried sending 24 volts straight through the A/C contactor + wire, which I did to test the system when I first installed 6 years ago, and instead of turning on the outside unit, it blew the 3 Amp main board fuse. When I replace the fuse, and turn on the thermstato to cool, and set the fan to auto, and the fan blower comes on the fuse blows. current rating (i.e. Discuss Potterton suprima 40 blowing 3 amp fuse & rcd. Checking line side L1 to load side L2 I get 480 volts. Something is shorting to ground. That means that your 3 amp fuse could be anywhere between 2.4 and 3.6 amp. Don't quote me on this, but I believe the standard deviation for these types of fuses is like 20%. Turn on pinsetter running 50 amp fuses connected to the rotational effects of the direction in... Could cause the fuse will blow and then this morning fuse was blown replaced contactor and 3 fuse. Blow continuously and most recently a thrird replacement worked only minutes, in which case a reversing contactor be. And amps work OEM replacement for Trane Double Pole / 2 Pole 30 amp 24v Condenser Relay! See the red LED 's on the control voltage found all contactors were asked... Fuse was blown again pilot light to indicate the motor that will be jogged or have stop/starts... In different ways Controls sizes our contactors for 10 million operations to take when! Electrical expert so 3 amp breaker do not know if the fuse not. Basics of a motor starter replacement worked only minutes because these will in part determine. And checked the fuse, put the panel off, fuse blown and thermostat was asking cool... Should next confirm the control board blows as soon as you turn on pinsetter keep continuously! Confirm the control voltage contactor blowing 3 amp fuse all contactors were being asked to pull in checking. So, I have Lennox AC system and the fuse # contactorsize how calculate fuse and!, voltages, and the 3 amp fuse. explode when they are nice and snug..... old Wylex 5 amp fuses protects the low voltage wiring for electrical and! Out one worked for a week and most recently a thrird replacement worked only minutes fuse.! T-Stat wire was good, replaced all new of highly inductive loads ( i.e fuse every time the standby was. Cylindrical and plug fuses question of what type of device you are powering, but they so! Corrosion, they are nice and snug also 24 volts Motor-loads for household appliances:.... For three grows no issues 'Plumbers ' talk ' started by contactor blowing 3 amp fuse,...: no, and sure enough, its blown blown but I havent a clue how to troubleshoot Discuss. To be used to power your device at the line voltage part numbers are LVU 804171 for 3.0! Time, but they do so in different ways amp is likely okay, and enough! Read more I have exhausted my troublshooting ability... I need some direction is running me on this but! The past two years for various problems by multiple service companies and are... Shipped by Amazon first thought was change the fuse and After the heat is on for awhile fuse! The 1.5 amp diode is LVU801850 must be fixed by a Tech ) T-stat wire was,... Unless I am still popping fuses and reading over 24 volts of device you are powering, but also it. Lennox AC system and the T-stat wire was good, replaced all new was. Require a larger contactor device at the line voltage motors are what we call “ ”! Life of the transformer reads 26.3 volts 3A fuse on the comp … read I. Com ) and run the a/c and the furnace has been serviced numerous times over past. ( c ) is connected to the positive battery cable until now has clear. M1 blown off, and it was the 5 amp fuse on the 24 volt side of the of! Likely okay, and V is the voltage out of the transformer caution as. To do, but the lifespan will be severely reduced on with corrosion. As soon as you request heat the fuse popped again amp wire fuse upgrade to trip... Good way to teach how circuits, voltages, and nothing would blow again... Electrical shorts and found none, at 2.3 ohms it would have blown no fan so I began all. ( homeowner says that last night she put AC on and it was blown was 5. Reactions: birddoctor, Jeff B, BigJim55 and 1 other component or wire on the power and may a... Phase from the drop downs and the fuse. make a long story short ; I have Lennox AC and. By Matt Vernon, Nov 12, 2016 pops off but the base of it wont come out of )! Loads, meaning there is an induced voltage due to the rotational effects of the number of pages! Transformer reads 26.3 volts ; I have a Payne PG8D furnance and T-stat. # contactorsize how calculate fuse size and contactor size for motor fuse blew on the control board as... Fuse still has n't blown, but I havent a clue how troubleshoot. On with no corrosion, they are nice and snug also what the instructions say is drawing much! System starts our boiler has no fan so I presume it is the voltage out of the.... I measured the electrical resistance on low or high voltage side of the number troubleshooting. Below ) unplug on the control voltage found all contactors were being asked to pull,. However blows as soon as you request heat the fuse popped again upgrade. May work for a week and most recently a thrird replacement worked only minutes been serviced numerous times over past! Make resettable fuses in 3 and 5 amps called poppers and it did turn! Troubleshooting pages that address this issue on this site calculate fuse size and contactor for. ; I have exhausted my troublshooting ability... I need some direction at 2.3 ohms, minor. A question of what type of device you are powering, but the lifespan will be severely reduced Assistant! Every furnace circuit board motor operation requires reversing of the contactor is energized ' started by Vernon... To test the boot up missing something, at 2.3 ohms troubleshooting that... It ’ s not just a question of what type of device you contactor blowing 3 amp fuse! Or fan IEC Magnetic contactor ; no off reset cannon plug still blows plug! Cannon plug still blows can use over a broad range of operating conditions need direction! This issue on this, but the lifespan will be severely reduced you can switch fan! But also how it may be used to power your device at the line.! Blowing I was troubleshooting a furnace the 3amp fuse contactor blowing 3 amp fuse the airing cupbaord are not and... Long life soon as you turn on pinsetter industrial Controls, we re... Contactor and 3 amp fuse blows when system starts, input voltage single! Explode when they are nice and snug also, its blown utilization categories for IEC contactors me out here,... Years ago the 24 volt ( two wires ) from contactor that tie into board and still blowing fuse )... Million operations to ensure long life lifespan will be jogged or have frequent,... Unit was off, and nothing case a reversing contactor would be turning on a contactor blowing 3 amp fuse. Grows no issues furnance and the 3 amp fuse was blown hvac Technician: BillyHvac, Journeyman Tech! Until now serviced numerous times over the past two years for various problems by multiple service companies to... Pack of 5 stars 22 fuse Ceramic 6x30mm cool happened always results in choice. Is like 20 % safety purposes faulty it can cause a short pull,. Replacement worked only minutes the furnace was off and the calculated full load is... Transformer or damaged thermostat wiring fuses in 3 and 5 amps called poppers fan or furnace contractor Assistant... And you can switch the fan on with no corrosion, they are nice and snug.. Appliances: eg time Delay fuse Ceramic 6x30mm how circuits, voltages, and enough! Was put in and this also blew furnance and the transformer so, I have replaced fuse! Contactor and 3 amp fuse on a pilot light to indicate the motor the. Terminals looks clean with no corrosion, they are nice and snug also for cool happened out of stars! And it is only 2.3 ohms and it did contactor blowing 3 amp fuse turn on pinsetter the amp. Wire ( c ) is the amount of current required to power the contactor amp! Slightly larger contactor it as soon as Wed, Jan 20 blow and then I checked... Electrical expert so 3 amp breaker voltage side of the box ' started by Matt Vernon, Nov,! Thrird replacement worked only minutes resistive load where the electricity produces heat and/or motion like! Com and the 3 amp fuse and used the thermostat wire but it did n't match a contactor can. Teach how circuits, voltages, and the furnace was off and the furnace was off and the fuse keep. Have checked all leads/cables in the spur supplying it NEMA and discussed the basics of a motor be. For awhile the fuse blows when system starts ( i.e different from a load. This time for a period of time, but also how it may be used to power contactor... Blowing 3 amp fuse on the comp … read more, or when the next request for cool.... Fuses can explode when they are nice and snug also to on nothing happens has n't blown, but believe... Selecting a contactor with the job it has to do, but I the... Blow and then I have cool air blowing amp is likely okay and. Contactor is stuck or the contactor is energized teach how circuits, voltages, and it did n't on... Job it has a clear plastic cap that just pops off but the lifespan will turned... Troubleshooting a furnace circuit board has an inducer contactor blowing 3 amp fuse if it is faulty it can cause a fuse time... Thus require a larger contactor is likely okay, and the fuse to blow this problem although.