Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

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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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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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Posted on Jan 02, 2017

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My furnace is an older type furnace and it was working fine yesterday but the blower won't shut off after it runs for a while it run continueally I was wondering what I could do to fix this pr


When you say 'older furnace' I am assuming old enough to where there is no circuit board. They will usually have a thermally activated 'fan-limit' switch with a bi-metal sensing device. Most older furnaces had either a Honeywell or a White-Rodgers controller and they look almost identical. With the furnace door off, look towards the top of the furnace vestibule (above the flame area) for a rectangular box approximately 3 1/2" wide by 5" long. Tap the side of the box with a screwdriver and if the thermostat setpoint has been satisfied and the gas burners have been off for more than three minutes, the fan should then shut off. The switch contacts are either stuck together OR the bimetal sensing device is weakening from thousands of cycles.

If it continues to run, squeeze the sides of the 'lid' of the box and remove the cover. Inside you'll see a round moveable dial with three pointers, marked 'fan off, fan on, and limit'. The 'limit' should remain at or near the 200 degree setting, the 'fan on' can be anywhere around 140 and the 'fan off' can be anywhere near 100 degrees. It is the 'fan off' position thats giving you the grief.

Turn the thermostat up again and sit there and watch the dial do its thing and yo'll understand better how this control works. Watch it rotate past the 'fan on' setting and observe the fan turn on. Turn the thermostat below room temperature and watch the gas shut off and the dial rotate back towards the 'fan off' setting. If it hangs up again before twisting past the setpoint, you can slightly increase the setting to compensate for the weakening bi-metal element. But just a tiny bit, not a great amount or you will have the fan shutting off with a lot of residual heat still in the heat exchanger. The idea of the delay in shutting off the fan is to remove all that residual heat and transfer it to the house.

There are other brands that utilized 'timed on' fan controls, and there are a few other variances of controllers but what's described above should cover the vast majority of older furnaces.

Remember there is ELECTRICITY inside the fan control and any adjustments should be done with the power OFF !!!!

Dec 26, 2014 | Heating & Cooling

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 | Heating & Cooling

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 | 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

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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.

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Gas furnace short cycling. checked by experts no solution


This is tough one. If you have an older mercury type thermostat, behind the cover theirs a small copper pointer that points to some numbers. This is your heat anticapator. This setting has to match your milliamp draw of all the controls on your furnace. If set to low it over heats and fools the thermostat into thinking its satisfied. Move the point to a higher setting in little increments. Hope this works for you. Can't help with the vibration without hearing it.

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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

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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.
Matt

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