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Furnace thermostat I don't think my thermostat is working properly. It is an older dial type. Square body and non progammable. I don't find it in the product listing so I picked the honeywell round mechanical choice so it would let me post my question. I have taken the canned air and blew out the dust and used a soft bristled tooth brush on parts. Can you tell me how to troubleshoot it?

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Re: Furnace thermostat

Get to the wiring at the thermostat. Take a small jumber wire and jump from R to G on the thermostat. Hold it there a few minutes to see if the system starts heating. If it does, you have a bad thermostat. If not, you have other issues.

Posted on Jan 18, 2008

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Coleman electric furnace model 3500-816 will not come on what is the most likely problem besides thermostat

The thermostat is usually NOT the problem, it is just the first thing people generally THINK is the problem. First thing I would do, would be to check the control transformer and see if it has a tiny square built-in circuit breaker. It should be about 1/4"x1/4" square and if tripped, it will show a little white on the sides. If so, it could possibly be tripped and a simple reset will re-establish your control voltage that will allow the thermostat to do its thing.

Sep 29, 2015 | Coleman Heaters


Furnace Ignitor Care ? Home Furnace Repair

One of the many problems since the introduction of the ignitor to the home furnace is the fact that they often do not last very long. This is especially true of the older style gray glass type ignitors. To prolong the life of these types of ignitor there are some things that you need to know that will help you.


First off make sure that you never touch the gray surface with you hands or any other part of your body. The oils from your skin will cause them to burn out.

Make sure that the ignitor you are using is the right part for the furnace you are installing it in.

Make sure that your furnace is sized correctly. If the furnace cycles often you will cause it to burn out faster. You only get X number of cycles from an ignitor. A properly sized furnace will run almost continuously on a very cold day. A dirty air filter can also cause your furnace to cycle more often and cause burn out. If your thermostat is not set up right and cycles your heat often you ignitor will wear out faster.

Check the voltage in your home. It should be between 110 and no more than 125 volts. High voltage will cause excessive wear.

Make sure that if you have a boiler that the return water temperatures are not below 140 for an extended period of time. This will cause condensation which if it drips directly on the ignitor while it is hot will cause immediate burn out.

By checking these things when you replace your ignitor you may be able to extend the life of the new ignitor.

on Jan 31, 2010 | Heaters

1 Answer

Blower does not start

Try turning the thermostat fan control switch to the 'on' position. If it comes on, it will probably be on high speed but that's ok at least you can get the house warmed up. If it doesn't come on, the motor is probably bad.

If its an older furnace, the fan controller could be defective. Look for a rectangular box in the furnace vestibule about 3"x5". Remove the cover and you should see a dial. That dial sould rotate as the heat exchanger heats up and the result is automatic starting and stopping of the fan. There could be a wire burnt off of it or the control itself is bad.

If its a newer furnace, the fan relay on the circuit board has failed. If that's the case, usually a new board is required to make the repair.

Mar 11, 2015 | Heaters

1 Answer

If i give power to furnace,will thermostat work it in a power outage ? The system is 40yrs. old . the thermostat is a round dial type. Williamson : Temp-o-matic furnace and...

it should. the transformer,110v to 24v should be part of a 40 yo furnace. if not just find that tranformer and add power to it also

Mar 18, 2011 | Heaters

1 Answer

Themostate doesn't register correct temp.I will move dial to 90 and it still only feels like 70

Need more information. What type of thermostat is it?Does it control a Heat pump, Gas furnace electric only. What type of house do you live in, example, new and tight, older and poor insulation? Please send more info. Thank you. :)

Jan 25, 2011 | Heaters

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 Heaters

1 Answer

Can't get thermostat to work

do you have an a/c. you need to go to the furnace and find ware the t-stat connection is the connections will be R= power, w = Heat, G = fan, Y = cool, C or X = common, you will connect the same wires that connect to the furnace to the connections R G Y W C on your tstat. for the 2 black and 2 red i would turn off the power to the furnace twist one black and one red together then take a continuity test between the reds and blacks that will tell you witch ic witch.

Jun 16, 2009 | Honeywell Electronic Programmable...

2 Answers

Furnace blower not working how it should

first off buy yourself a honeywell stat, in my personal opinion lux stats are garbage, I have run into so many that are bad stats !!! but as far as your fan not shuting down, sounds to me like your fan center on your circuit board is bad and will not shut down the fan when needed, you will have to replace the circuit board, as the fan center is a part of the whole of the circuit board, hope that helps

Jan 19, 2009 | Coleman Propane Forced Air Heater...

1 Answer

Forced Hot Air Heating system doesn't maintain thermostat setting

It sounds like you may have issues with the furnace. A qualified professional can go over the system and the house to let you know if the system and unit are properly sized. The poor performance of a furnace can be a sign of carbon buildup in the furnace.
Good luck, hope this helps.

Jan 10, 2009 | Honeywell Focus 6300B 5-2 Days...

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