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Tstat wiring when wiring the tstat the wires touched now i have no power on the low volt wires,and looked all over cant find a fuse

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Thanks for your Question,
one of two possiblities, first and most likely is that you have blown the Transformer in the Furnace, second would be that you have blown the small car fuse that is on the circuit board in the furnace, if you look really hard you will find it, it looks like an automotive fuse, should be about three amps, if it is the fuse, then its a simple fix, make sure the power is off, replace the fuse, if its the transformer, a little more involved work is needed, but still should be pretty straight forword, and again, please make sure the power is off when replacing, hope that helped ! please be sure to come back and let us know how I did for ya, thanks again,
mr.grzz

Posted on Jan 22, 2009

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I have control pcb on my bryant hvac home unit. HK42FZ009 blows F1 24 3amp fuse. It happened about a year ago and replacing the fuse solved it until now. New fuse blows immediately. Looking for...


Take everything off the board. With power on and carefully, one by one put all components back on until fuse pops. This will narrow it down. Obvious short to ground in one piece. Verify 24 volts from transformer.

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Blower motor never cycles off when in AC mode, even when the desired temp is reached


Not sure if you ever figured it out. Or if someone figured it out for you. Shows no one answered you on here. So I thought I would ask you a question plus also say what I thought it was . When the unit and or the thermostat was replaced? Was the thermostat wire that is inbetween the unit and the blower ever replaced? A service tech should have checked if the tstat wires were touching or shorted together. If you go by color which you should never do. Red is usually 24 volts or power, green is fan, yellow is cooling, white is heat, orange is the reversing valve if its a heat pump, orange to O terminal if RV in cooling or orange to B terminal if RV in heat. O or B terminal depends on who the manufacturer of the unit is. Blue wire is usually the common. you should always check to see how it is wired at the board or relay in the unit. not everyone wires it by the colors. If your fans low voltage wires are touching the low voltage 24 volt power wires in the unit or if the wires are shorted or touching in the wire sleeve or at the thermostat. the blower motor will never shut off. Or if the blower motor is wired directly to line voltage it will never shut off and testing the low voltage wire wont matter.

Your question was from last summer. So I am assuming you had someone figure it out by now. If not then check my suggestions. Hope that helps you.

Jul 22, 2013 | American Standard WCZ036F Air Conditioner

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I have a Rheem Furnace Model # RGPH-07EAMGR Serial # FD5D307F16000271. The unit keeps blowing the 3 amp fuse on the ciruit board. I verified the amp draw from the blower motor and it is well below the...


Hi, this fuse is for your 24volt controls, which means anything that runs on or is controlled by 24 volts. Check the thermostat wires at the board where they come in, as I have seen them skin the insulation and ground out blowing this fuse. The contactor coil on the outdoor unit is 24 volts and may be shorted. Its a matter of looking at all of the low voltage wires to the indoor and out door unit. If you have a dog, I have seen where they chew the wires causing a short, or from the sun causing the insulation to come off and short.Something is for sure causing a dead short on the control side, It would not be the stat unless you have been into the wiring behind it and maybe the R, red is touching. (9 times out of 10, a low voltage wire is touching metal or another wire, common. If all of the wires look good, you will need to do the process of elimination. Go to the outdoor unit, and the wires coming outside from indoors, if its a gas furnace, you will have 2 wires. Take them loose, and this will take it out of the circuit. Now try another fuse. If it holds, your problem will be in the outdoor unit. It would have to be the contactor coil. It has 2 small wires, one on each side. Pull them off, tape them so they dont touch and wire the 2 wires coming out back up. When you restore power to the outdoor unit, if it holds you will know its the contactor, it has points on it and this is what closes to start the fan and compressor, just 24 volt coil. This is not a high voltage problem, only a low voltage, so checking the amp draw on motors are wasting your time. After you eliminate the outdoor unit, take each wire off of the terminal block at the indoor unit. Write down how they go back!! This eliminates the stat wire and thermostat. If the fuse holds, you problem is in the stat wire touching in the wall, or at the stat. Most contractors will have an extra wire that can be used. You will need to ohm out the wires to see which is touching. Last thing to do, is kill all power, and remove the 4 screws on the board. It will have stand off's on it to keep the back from touching metal. Look at the back to see if it is burned any where on the raceways. If so, you have a shorted board. Please follow all of my steps and you will find this short. It is really very easy, now that you know its the low voltage side blowing the 5 amp plug in fuse. Process of eliminated the parts like the outdoor unit, thermostat by taking off the wires at the indoor unit and so on. You will find it. Please let me know and rate me on my help to you.
Shastalaker7
A/C, & Heating Contractor & Tech.

Jun 14, 2011 | Heating & Cooling

1 Answer

Condenser unit will not run. has 240 volt at contactor, but no 24 volt control power to coil. Control Transformer has 24 volt output. Blower will run but condenser unit does not operate.


Hello, check the tstat wiring going to the unit for any breaks in or if it has come loose between the indoor unit and outdoor unit. Also, chevk if you are getting voltage from tje control board between the y and c terminal, if not the control board is bad. Last thing to check is remove tstat and jump the y and r wires there if this starts the unit then you have a bad tstat.

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1 Answer

I set the tstat to cool everything ok i set tstat to heat it blows the fuse on pc board


Check for wires rubbing together from the thermostat to the furnace. More than likely there is a short somewhere in the low voltage wiring. Check the wires on the thermostat also to make sure none are touching together.

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2 Answers

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now you can go through your low voltage wires one by one and test them unhook all the wires to your outdoor condenser at your indoor unit(furnace or airhandler) and try turning it to cool now if you blow the fuse the short is between the tstat and the indoor unit if the fuse is still good leave it on cool and hook up one wire at a time to your outdoor unit starting with R a lot of times your contactor or your defrost board will short out on you also look for pinches in wires wires with cracks in the insulation and wires touching metal this situation can be a real pain sometimes i would recommend calling a hvac company if you start to get stumped
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2 Answers

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2 Answers

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1 Answer

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What kind of system do you have? The fuse is usually located on the circuit board inside the furnace/air handler. It's probably a spade type and would be either amber or purple. 3 or 5 amps.

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1 Answer

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