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Shorted thermostat furnace was not getting warm and kept shuttung off after about 30 seconds . I was tampering with the wires from the thermostat and touched both terminals on circuit board and it sparked now the furnace wont even ignite

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You may have well blowen the pcb check the fuses or trip switch in elec panel

Posted on Jan 10, 2009

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Mid efficient Carrier furnace that wont stop running.

I am assuming for the first explanation, the thermostat is not being satisfied. If this is the case, you may have a duct fallen off and is not heating the interior of the home. I have had several supply ducts fallen off the supply under homes in one subdivision because the original installers only duct taped the supply ducting to the headers and the duct just blew off. This happens more often than I would like to mention in attics spaces also. So if the thermostat is not satisfied look for major leaks.
2nd part, you may need to replace the themostat wire if the wires are shorting out. In particular the white wire is the normal color for thermostat for w connection for furnace control. If a white wire is shorting to any control wire that has 24 volts on it, like the green wire for the fan, red wire for the control voltage to most controls etc, the furnace will run continuously as long as the furnace is getting the voltage on the white wire. To check this out, turn the thermostat to off and check the voltage on the white wire to common. If 26 volts is present, the wire is shorting somewhere and the thermostat wire that is damaged needs to be replaced. I have seen pets, rodents, lawn mower blade damage, bad insulation problems and overdrawing components causing theromostat wire deterioration.
3rd possibility, is remote due to the unit has been installed for 10 years, but if recent addtions were made to home, the unit may not produce enough heat to heat the additional demands of added rooms. In particular, this winter has been really cold in some locals and the unit may just be undersized.
Hope this helps

Feb 05, 2015 | Heating & Cooling

1 Answer

Bought a thermostat . installed it and the furnace fan will not shut down

You probably have a pair of wires for the fan and a second pair for the furnace. The thermostat should make and break the connection to the fan to turn it on and off and make/break the connection to the furnace. You should have looked at how they were connected to the old one and labeled them. You will probably have to open the furnace to see which wire goes to what. If you get the fan wired correctly the thermostat should work.

Nov 12, 2013 | Heating & Cooling

1 Answer

I have a Rgeem Criterion II Furnace. The blower started to run as it should before the burners lite, after about 1 1/2 seconds it shut off. I checked the control panel all LED's are lit none are blinking....

This blower is controlled by a timer that is built on to the PC board. Can you tell if the burners are lighting at all? If they are not lighting then it is probably the gas valve. If they are lighting then it is going to be a thermal couple.

Oct 28, 2010 | Heating & Cooling

1 Answer

My mother has a Ultra Flex Inter Therm Model # 431900 heater in her mobile home. Last night she had it set on 65' but it ran & ran until it got up to 80' It will not shut off! It will not turn off even...

If you remove the furnace doors, and find where the thermostat wires come in, leave the breaker off, and disconnect the thermostat wires at the furnace. Turn the breaker back on, if it doesn't run, then you have a short somewhere in the wall, in the thermostat wire.
If this is the case, then the best thing to do, is to re-run the thermostat wire to a closer location.
The moblie homes, older ones, use thermostat wires that are not encased in a plastic cover, and they use metal staples in the wall to secure the wire, so they can short through the wires, and making contact,,, this turns on the furnace.
If the furnace continues to run,,, it is a control issue in the furnace it's self and you will need a repairperson.
If this helps please rate the new guy :)
Thank you ,

Apr 02, 2010 | Heating & Cooling

2 Answers

My Janitrol GU125-4 furnace will not shut off; cannot be turned off at thermostat, and heats the house to 80 degrees. I have to cut it off at the breaker. What is the fix?

Hi, it sounds like you may have a short in the thermostat or in the wires coming from the thermostat. The red and white wires are for heat. If you open the filter door, there should be terminal screws labeled R, W, Y, G and the 4 or 5 strand t-stat wire going to it. Just disconnect the W wire and replace the door, if the heater stays off you have a short somewhere in the thermostat circuit. Unless you just replaced the T-Stat recently, a rodent may have chewed through the wire or a nail pierced the wire, or ???,  you get the idea. You may need to pull a new T-Stat wire.  Good luck and comment back if you have any other questions.

Jan 09, 2010 | Goodman Heating & Cooling

2 Answers

I installed my RTH2310b honeywell, and called tech support because my old thermo had two connections, and none were labled. I have a gas furnace and hot water heat in a 1911 era home. Sop the guy I could...

Was there a jumper wire from the Rc connection to the Rh connection? And did you remove it? If you did you will need to re-install that jumper wire. You will need to use the jumper wire when you have a older furnace with just two wires. Verify that information with the instruction manual that came with the thermostat. And make sure that you always disconnect the power for the furnace before working on or changing the thermostat wires because it uses 24volts and you could shock yourself(24 volts stings a little) and or short out the voltage regulator for the furnace. Also some older furnaces require a thermostat with a "heat anticipator" setting and may cause a problem with the furnace if a compatible thermostat is not installed.

Nov 11, 2009 | Honeywell Electronic Programmable...

1 Answer

Have a goodman furnace wont fire check light staying red no errors and i cant smell gas but my gas is on could it be there limiter switches there two upper and lower please help

Probably not, take a small piece of wire and open up the furnace. On the control board find the R and W terminal. It's ok to touch the terminals because the door safety switch will be open. Take that small piece of wire and jump the R and W terminals. Then hold in the door switch to see if the furnace starts. It may take 30 seconds or so so tape the switch closed. If the furnace starts you have either a bad thermostat, broken thermostat wire or a lose wire. If it still does not operate, you have a bad circuit board.

Oct 16, 2009 | Goodman GMS90703BXA Heater

1 Answer

Short cycling..continually..minimal heat

Is this furnace standing pilot or electronic? if standing pilot turn power off then take t-stat off wall and connect the wires labeled r and c together and see if that keeps furnace working. If electronic check flame sensor you can check flame sensor buy cleaning with steel wool. if that doesn't work then try t-sat.

Jan 21, 2009 | Coleman Propane Forced Air Heater...

1 Answer

Furnace not cycling properly

sounds like the flame sensor needs to be replace. You can try cleaning it with steel wool. This will get you by for a little while.

Jan 17, 2009 | Honeywell Electronic Programmable...

1 Answer

Replaced Fuse on Board. Unit keeps running

Sounds like crossed or shorted wire going to the thermostat. Disconnect the wire from the thermostat and see if it shuts off. If it does, it is the thermostat. Then disconnect either the white wire or red wire at the control board and see if the furnace shuts off. If it does, its the wiring. If it continues on, it is the control board. Remember you will need to tape the access panel door switch to the on position to be able to run the furnace with the panel off.

Nov 22, 2008 | Goodman GMS90703BXA Heater

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