furnace control board fuse blows when ac is turned on
Click here to upload your image I am having this problem. Turned on the heat and it blew the fuse again. @Tester101 The furnace is a Tempstar. If you get the same results, you better look a little closer at your work. The exhaust motor kicked on then the gas ignited and after a few minutes so did the fan and I had heat. Each igniter is measuring approximately 3Ω. Your answer was very helpful in the diagnosis so I'm marking as correct. The furnace should start. Blown fuses in furnace when turning on Central Air [ 6 Answers ] Central Air - Goodman Furnace - Tappan Thermostat - Robertshaw (Programmable) I keep blowing a 3 Amp fuse that is located on a computer board inside of my furnace panel when turning on the Central Air unit. Whenever the fuse blows, you replace with the fuse with a similar capacity one without realizing the folly of this action. Now, on the new stat wire, disconnect the Stat completely. At the time, I did know what the problem was when I originally replaced the board. I have a Tempstar Model NTC6100KFG1 gas furnace. The thermostat shorts the black and red wire terminals together when heat is called for which will blow the fuse every time. Look for shorted contactor wires, a shorted contactor, or bad heat pump control board (if applicable). I have a Tempstar Model NTC6100KFG1 gas furnace. My furnace is a Concord model CG90UB. You will most likely find the insulation frayed and touching something that goes to ground. I have goodman unit with furnace inside and and outdoor AC/heat. I have replaced control unit in dash fuse still blows with controller and A/C unit unplugged. Now turn on the thermostat. Small Fuse – Somewhere down the line, someone replaced the fuse in the AC circuit board with a smaller capacity one which was inadequate to bear the load of your AC. You can also provide a link from the web. It's been off for a month or two as we've been changing seasons here. The furnace runs on 12 volts DC, that is why you will find its wiring protection on the 12 volt DC fuse panel, instead of the 110 Volt AC circuit breaker panel. Your thermostat wires or something in the heating circuit are going to ground. I have no temperature control, vent selection, rear defogger, outside/inside vent or A/C. ran for 8 hours. Then when it kicked off it didn't kick back on . use 14 ga wire and for goodness sake, FUSE the blasted thing at no more than 15A!!!! Click here to upload your image The guy has a new condensing unit installed last year. I also have blowing fuse problem. Also, it may not be that surprising that the cool works when the heat doesn't. On the furnace control board again jumper the red to the white. (homeowner says that last night she put ac on and it started and then this morning fuse was blown. Well, the fuse blew. Follow the wire from the W terminal all the way back to the thermostat. I was blowing the 5 Amp fuse on the control board for my forced air gas furnace. Well tonight, randomly, the ac shut off. I removed all the wires going to my thermostat and it would not blow the fuse when powered on. That makes sense since the voltage to the board could jump up to line voltage possibly, https://diy.stackexchange.com/questions/126059/the-5-amp-fuse-on-my-ac-heater-control-board-blows-when-i-put-the-setting-to-hea/126074#126074. Worn and/or Faulty Parts I checked the voltage at the wall while the heater was running and I was getting a little over 27 volts AC but I think that should be fine. Any ideas? Once i purchased a new thermostat, the fuse would still blow. It's been off for a month or two as we've been changing seasons here. Edit: If anyone knows where to find a schematic for this board, that would also be very helpful. Goodman split unit, control board has 3amp fuse which blows when a/c is turned on. Same problem. If it's a furnace with an separate A\C unit, the only thing in the furnace that is on with the A\C is the blower. Check your ignitor grounds. AC works fine but as soon a I switch to heat the fuse blows. The yellow light turns off 2. V=IR, or so I always thought. There is some Furnace interface in the AC control circuit board. If the fuse doesn't blow, reconnect one thing (like the igniter) and try again. If fuse blows on the temporary wiring then you have a SHORT IN THE FURNACE. What make and model is your furnace? Can you guys point me in right direction to figure this one out ? Bad grounds on ignitors are gremlins. I ended up replacing the thermostat with a more expensive unit and it solved the problem. If a wire becomes loose, it can cause a short. A working furnace naturally causes vibrations that can loosen internal wires. Please see my updates to the question. I have followed your instructions and found the components that cause the short. How can I figure out why the low voltage furnace fuse blows on heat but not cool. Furnace was working fine through the summer blowing the AC. Problem: Fan will not come on in the “ON” position or your fan will not come on when you turn the thermostat down in the air conditioning mode.. blower motor control works. I have yet to find a model number marked on it. Its just being used for cooling right now. The 5 amp fuse on my control board blows as soon as you ask for heat. https://diy.stackexchange.com/questions/126059/the-5-amp-fuse-on-my-ac-heater-control-board-blows-when-i-put-the-setting-to-hea/126537#126537. The model number should be on the nameplate, which may be inside the unit. The thermostat does not require a ground wire to operate, in a simple furnace system only the red (24vac) and white (heat call) wires are needed. Blowing Low Voltage Fuse Breaker Trip | Control Wiring Troubleshooting - I’ve got a 5 amp fuse that keeps popping on a circuit board. The furnace fires up just fine but after a few minutes the 3A controller board fuse pops. Sometimes, your furnace may seem like it has blown a fuse, but it is actually suffering from loose wire connections. 6. Including the make and model of the furnace might be helpful. I did some researching and found out it was the 3A fuse. Locating, fixing or replacing loose wiring is difficult to do by yourself. The second and the third time it lasted much shorter. But I don't fully understand the result or where to go next. When I went to turn on the heat, I found that it would immediately blow the low voltage fuse on the control board. Its a 4 ton Goodman not sure of the make and model. The fuse powers the AC control unit. I replaced the igniters and the control board but neither was the problem. Fuse DOES NOT blow. The thing is when I put the stat back on the wall it snaps into place with contact pins touching the set screws so there is nothing I can do wrong there. Any ideas out there. This is what I observed happening before the fuse blows: 1. Paul, I did what you suggested (jump the wires inside the house at the t-stat) and the furnace kicked off just like it is supposed to. I made sure the new thermostat was compatible. Did you figure out what caused the original board to die, or did you simply replace it? I reconnect all and then disconnect thermostat wires from furnace. Repeat until something blows the fuse. I even installed a new t-stat. When I went to turn on the heat, I found that it would immediately blow the low voltage fuse on the control board. The modern furnace is a marvel of technology, especially when compared to the furnaces of yore, which were basically large ovens with pipes hooked up to them. There was a big black mark in the middle of the 3 amp fuse. I turned off the input power and attached terminal R (24 VAC power to thermostat) and the fuse blew. When I was first wiring the PEK from the Ecobee3, I did notice there was only one "G" wire to control the furnace fan which I found very odd. This is significant difference. Did you make any changes before the fuse started to blow? Furnace was working fine through the summer blowing the AC. (max 2 MiB). Contemporary furnaces have most of their operations linked into a furnace control board, which is the core of how the furnace works. If you do it may be touching the common wire. $9.95 $ 9. Exact same problem. The control boards on Goodman furnaces go out all the time, and that is where the problem lies. Keeps blowing 3A automotive fuse on electronic control board. (At least on DC circuits). This can be anno car ac fuse keeps blowing the blower motor fuse is inside the car on the Replace the damaged fuse with everything in your car turned off. We’ve been serving Oklahoma since 1978. Visually inspect the wiring that is above ground to see if there is any damage that can be repaired. This will blow the fuse on the control board, causing the draft inducer to not start, which then stops the rest of the furnace functions from working properly. Since it works fine when you jump it at the furnace the problem is in the thermostat wire. I put the stat back on and turned on the AC and the fan all good. No other accessories. Now some questions. I took a look online and someone said to check if the furnace board fuse blew…and it did. I did a recent service call and the 5 amp fuse in the circuit board on the furnace was blown. If this is the case, you are doing something wrong when you are connecting the stat. I replaced the original control board with a Honeywell ST9120U1011 universal control board about two years ago after the original one blew. Glad you got it fixed, this page here had some useful leads, mentioned the transformer being bad as a possible cause. If the fuse blows again when the same valve is turned on, there must be a short in the wiring. But if I connect both of them, the fuse blows. He just called and told me fuse is blown again. Every troubleshooting tip I found said to disconnect the W (heat relay) and R (24V supply) terminals from the thermostat and jumper them on the control board. Now at the stat location twist together the red and the white. Switching back to "cool" still works fine. I will check for a grounded wire in inside the unit in the attic. If so, what is the proper procedure for checking these? If I connect only one of the igniters, the control board is fine. Solution: Have a furnace repair person find the short and repair it. The first time it blew fuse, I replaced the fuse and it lasted for couple of days. It's when I switched over to "heat" that the fuse began to blow. I bypassed the thermostat and the AC worked just fine. Happy hunting and Good Luck. The blower motor does not kick on even when I jumped the fuse, just a slight humming noise. If that doesn't work, then you're probably looking at replacing the control board. To help keep your furnace wires tight, be sure to have your furnace system regularly inspected and tuned up by Pronto. I assumed that the pressure sensors would be active for heating or cooling but apparently they are only energized during the heating cycle. Costs around $142.00 if you don't have an a/c license. I even exchanged the t-stat for another new one. I checked, and my Ecobee was off. The 3 amp fuse blows a lot. It may seem like this is a no-brainer, but there are a lot of times where HVAC repairmen will get called to a home only to find that the furnace problem is being caused by the husband is turning the thermostat down and the wife is turning it up. I put in a new 24V transformer and a new control board. The AC and fan both functioned normally as before with this wiring setup. I replaced the blower motor earlier this year because it bound up. It could also be grounding on the furnace cabinet sometimes it is inside the cable but usually the problem is somewhere you can see. When key is turned on HVAC fuse blows. Could they be shorting together? So, a few months ago my AC wouldn't kick on nor the fan or furnace. With a good fuse in the AC work fine and you can switch the fan from Auto to Fan on with no problem. 1. Today I tried to turn on the AC through my thermostat and the fuse blew on my furnace. I can read schematic on door panel. I spun the fan with no resistance. If the fuse didn't blow, it meant the thermostat wire was shorting somewhere. If I turn heat on, then the 3amp fuse blew within 3 or 5 minutes. Many times when the furnace goes off on limit the fan blower will continuously blow because the furnace control board senses that the furnace has over heated and needs to cool down. @longneck Yes I did but I forgot to follow up here. I have a Philco Nordyne KG6RC 80C-12B furnace on the second floor (about 7 years old). I replaced the wire from the T-stat in the house to control board on the air handler in the attic so I know it is good. Bryant 80% 90 BTU Furnace (air conditioner) keeps blowing the 5 amp fuse on the control board. The overriding bad news is that I got no heat whatsoever; heat pump didn't run and the heat strips didn't activate regardless of the temp differential on the thermostat. If fuse does not blow then you have a short in the wiring feeding the furnace.. There are some threads that say the Honeywell B is not the same as blue/common. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy, 2021 Stack Exchange, Inc. user contributions under cc by-sa. Loose Wires. A fuse or breaker is designed to essentially police your home’s electrical use. Your furnace’s control board has a separate fuse … Should I check amp draw on compressor and both fan motors ? (5 times in last year including 2 already this spring) … read more https://diy.stackexchange.com/questions/126059/the-5-amp-fuse-on-my-ac-heater-control-board-blows-when-i-put-the-setting-to-hea/214590#214590, The 5 amp fuse on my AC/Heater control board blows when I put the setting to heat, thecomfortdoctors.com/blog/furnace-blowing-fuse. Electric furnace thermostat control wire. https://diy.stackexchange.com/questions/35692/how-can-i-figure-out-why-the-low-voltage-furnace-fuse-blows-on-heat-but-not-cool/171347#171347. However I am a bit skeptical. But as I've said, the AC works fine. https://diy.stackexchange.com/questions/35692/how-can-i-figure-out-why-the-low-voltage-furnace-fuse-blows-on-heat-but-not-cool/35728#35728. What I would do is temporarily run completely separate 12V (pos and neg) from the battery to the furnace. So I went and checked the fuse.. and it was blown. Try another one. Hello All, I have run into a little trouble with my A/C and furnace today. Still not sure what’s causing your furnace to trip the circuit breaker? I read on-line to jump the W and R on the control board and see if the fuse would blow or if the heater would kick on so I did that. I'm having a hard time believing that just the heating section of the control board went bad after two year while not being used all summer. I noticed my A/C had not kicked on in a while, upon inspection I found the 5 amp fuse on my control board was burnt. Thanks for the response. Took the panel off, and the fuse was blown again. I disconnect all in furnace, fuse blows immediately. The voltage out of the transformer reads 26.3 volts. The fuse is okay if I don't turn heat on. Everything OK? Well it is possible. Long story but heres the background: I have a York gy8s080b16dh11b furnace that is driving me crazy. Good luck. So I replaced the fuse, put the panel back on, and it didn't turn on. 3. What should I check next? When a valve is unable to open and close properly, it can sometimes heat up, causing an electrical short that blows a fuse. Does the fuse now hold. I reconnect wires to furnace, disconnect thermostat, fuse does not blow. Before I go and buy a new one, is there anything else I should check? RV manufacturers want the furnace to be able to heat you up, even if you are not connected to AC power. Is this a low voltage wire short somewhere? I have since forgotten. The fuse was blown. The furnace has two igniters as shown below. I have a Jantrol GMP 100-4. Check with your partner to see and ensure that the temperature is set right. 10. As soon as you request heat the fuse blows and when I try to run the fan to on nothing happens. Hello, I have been having some issues with my ac at home. I assumed it was the low voltage wiring from the wall t-stat to the control board so I got new wire and ran up to the attic. (max 2 MiB). So start by turning off the gas. I jumped the fuse and blew what I believe to be the transformer. Make Sure Your Thermostat Is Turned To The Correct Temperature. (Bingo, the old one is drawing too much current and blowing the fuse.) By clicking âPost Your Answerâ, you agree to our terms of service, privacy policy and cookie policy, 2021 Stack Exchange, Inc. user contributions under cc by-sa. The marginal good news is that it didn't blow the fuse when I turned the heat on the thermostat this time. Those things are typically reliable. When a "cool" request comes from the thermostat, the blower kicks right on. As soon as you request heat the fuse blows and when I try to run the fan to on nothing happens. Replace fuse keeps blowing. I am still popping fuses and reading over 24 volts. Also, do you have any other accessories that run on 24VAC? The 5 amp fuse on my control board blows as soon as you ask for heat. For the last couple years it has blown the 3a fuse on the board several times when we first turn the heat on before deciding to work normally for the remainder of the winter. That's probably cheap to do. It turns out I pierced the wire to one of the pressure sensors with a bolt when I replaced the blower motor. I guess I have two defective honeywell T-stats?!!?!? Following the advice of @longneck, I disconnected all the components that make up the heating circuit and reconnected them one by one. If anything exceeds the maximum allocated electricity for a particular fuse or breaker, they will fail, causing your furnace to lose power as a function of safety. With a good fuse in the AC work fine and you can switch the fan from Auto to Fan on with no problem. Do you have a C or common wire? For non-heat pump applications, do not connect the black wire to the thermostat. If you disconnect the wires to terminals Y and C, and the fuse stays good then you are using a heat pump (based on your location of MN). Any help would be appreciated. You can also provide a link from the web. Thanks for your help. Give Pippin Brothers, the Lawton-area’s most trusted heating, air conditioning, and plumbing company, a call. Today the Air cond. Since you mention an igniter I'm going to assume a gas furnace. If it did blow, it meant the control board was bad. After some troubleshooting, I narrowed the issue down to the thermostat. Since the cooling works fine the problem is in the heating wire (usually W or white). If you have a gas furnace, one of the valves may be failing. Then disconnect everything else other than the power in and the thermostat wiring. Since you have isolated the problem to the igniters, I would try just replacing one or both of them. If the fuse still blows with Y and C disconnected then the short is elsewhere in the low voltage circuit. Fuse controls all low voltage devices. For instance the igniters or the gas valve? Since they work individually, I don't think there is a short to chassis.
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