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The wires in my gas furnace have been messed with and the heat side of it no longer works. I need help getting it to work properly.

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Type in the manufacture name to get to that site, and somewhere type in the name & model #'sand search wiring diagrams..!

Posted on Sep 08, 2008


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Posted on Jan 02, 2017


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Ruud Achiever 90 - too much heat. My gas furnace works with propane. When it kicks in, it produces too much heat so that the temperature in some very well ventilated rooms gets to 80F.

The heat is controlled by the room thermostat so may be that is not working . It may have a variable fan speed which could help you . but you would have to check that out with the makers .

Dec 14, 2017 | Ruud Heating & Cooling

1 Answer

Pro 4000 thermostat is set on heat 73 but inside temp is 64 how do I fix? It's only about 2 weeks old.

If you switch to cooling mode and run that test, it may help pin down the problem with thermostat. However, the cooling wiring is independent of the heating system for most of the wires. Checking if the fan runs in the fan-only setting will check if that message gets to the HVAC system from the thermostat. (This only applies for forced air systems.)

There are two possible sources of the problem. The problem could be at the thermostat. Sometimes one (or more) of the conductor wires came loose from their terminals. Alternatively, one of those wires has broken. Pull the thermostat off the wall plate by pulling up at the bottom. Make sure that all of the wires are secured fully (either by the screw or push-connection). If any wire is damaged, cut off the broken section and strip a bit of insulation. Then secure the wire. (Use the labels to make sure that they are at the correct terminal.)

The alternative is a problem at the furnace. Check for power first. A tripped circuit breaker is not unknown. After that, the could be a problem with the control system, the ignitor (for gas or oil heat sources), a blockage at the exhaust or air intake (for high efficiency heating systems) or the blower motor (for forced air systems). Some heating systems have LEDs that indicate an error condition. Look to see if there is any blinking lights. Use your furnace manual to check what those codes may mean.

Clear around the exhaust outlet and air intake if you have any debris or snow/ice near there. Make sure to take safety precautions for a roof/chimney exhaust. Look at your furnace manual to see if there is a test option.

For my current HVAC system, you can test with a jumper wire. A few months ago, the heat didn't come on and that test proved that the blower motor didn't spin up. (The system has an interlock that stopped trying to provide heat when the motor doesn't spin properly.) A new motor was installed and the problem was solved.

I hope this helps. Please add a comment with more information about the heating system that you have and any error codes if you need extra assistance.

Cindy Wells
(I have a gas-fired electric ignition furnace. Without the blower, the furnace would overheat so it locks the gas valve and ignitor.)

Feb 12, 2017 | Heating & Cooling

1 Answer

Our Lennox Conservator G8E furnace goes through several ON-OFF cycles (we counted up to 10 clicks) before it stabilizes and stays ON. Once it's ON it works fine. - Any suggestions?

If its a gas furnace it could be the heat sensor on the pilot flame unit. When the sensor is failing it stops telling the control that the pilot is lit properly and the furnace goes thru another start up sequence.
You can try to scrape any flash and dirt off of the heat sensor rod to clean it or remove it and clean or replace the sensor or the pilot assembly. There are plenty or furnace parts on Amazon. The next most likely thing is the relay board is ready to fail that part is ~$80 but you need to get the part number right and be experienced with wiring.
WARNING-DANGER B4 you do anything to your furnace Turn Off The POWER first! If there is no plug or switch near by, shut of the circuit breaker! If you don't know what any of this means then you are likely not a good choice to mess with this device
Be Safe :)

Nov 09, 2013 | Kitchen Appliances - Others

1 Answer

I have a Rheem A/C Heat Pump split with gas backup. The gas unit is mounted in the air flow directly before the A/C HP coil. Should the gas unit be wired as stage two heat, or is it OK to wire it as just...

Stage 2 is okay as long as there is a fossil-fuel kit accessory wired in the field control wiring. EM heat would only allow gas furnace operation if the thermostat is set for EMER HT mode.......this is not ideal and not recommended. Dual-Fuel applications require a fossil fuel kit.
I'm including a link with information on one type of fossil fuel kit. It explains how it works. If you have limited HVAC service knowledge and/or experience, I recommend having an experienced service technician check your system operation in all modes to ensure proper operation for longer system life at peak operating efficiency.

Mar 07, 2010 | Heating & Cooling

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You will have to look in the furnace to see what color wire goes to the varios terminals on the furnace it should be labeled R,W,G,Y record the wire colors to the terminals in the furnace and wire the thermostat accordingly.

Jan 09, 2010 | Heating & Cooling

1 Answer

Hi Proper way on wiring furnace.

I can give you a start, For heat only, R terminal on furnace to Red wire to R or RH terminal on thermostat. W terminal to White wire to W terminal on thermostat. G terminal to Green wire to G terminal on thermostat. This will get you heat but not air conditioning.

Jan 06, 2010 | Goodman Heating & Cooling

2 Answers

My goodman gas furnace is not kicking on. the light on the unit is saying that it should be working but it is not. there is no pilot light, the fan is working the heat is not

If you are not getting any codes from the board, then the furnace is not getting a call for heat from the thermostat. A wire may have come off, the thermostat not properly wired, or a break in the stat wire. On a call for heat, you should have 24vac between W and C on the circuit board. This will let you know if you are getting a call for heat all the way back to the furnace.

Oct 01, 2009 | Goodman GMS90703BXA Heater

2 Answers

24v wiring for RHEEM heat pump

Brown wire connect to com C on terminal block in your furnance (0VAC from 24VAC transformer)
Yellow turn on compresor (hot wire from 24VAC Transfrormer)
Blue switch Valve from AC to Heat (hot wire from 24VAC Transfrormer)
Purple prevent starting compressor in Heat pump and furnace in same time

Jul 02, 2009 | Ruud UBHC Air Conditioner

1 Answer

Heat pump

What type of furnace? strip heat....gas... I would check the reversing valve.Run the unit in cooling have someone switch the stat to call for heat....."Whooosh!!!" the reversing valve will switch over.Other methods of switching the valve , remove one wire, remove the nut and slide the solenoid off the valve will reverse. The switching solenoid can be checked magnetically by using a small screwdriver. Switch from cool to heat or heat to cool this way you can check if the valve is getting a signal .
Heat pumps are a fairly complicated simple device..... sometimes just switching the valve back and forth a couple times gets it unstuck. Remember air coming from the duct will feel cooler than air from a gas furnace .
Most customers don't think they are working when they really are. 100 degree heat is not that hot to 98.6 degree person who is used to 120 degree gas heat!

Jan 10, 2009 | Heating & Cooling

1 Answer

Heat pump wiring

yes i can , you need to hookup the r and the o together so that the reversing vvalvce is allways energized . so with that im mind send r,y,c,o to theout side unit. at the ahu you'll hook up the 5 wires for the furnace, r g w1 w2 com and at the thermostat r,w1,w2,y,g,com,o then you will be set (the o get hooked up to o and goes straight out side.

Dec 03, 2008 | York Yankees Bedding MLB Comforter

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