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

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Thermostat ct87k for a gravity furnace

Replaced the thermostat and the heat will not come on. it onlys has to wires. trying to find out why it won't come on.

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4 Suggested Answers

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SOURCE: Honeywell CT3611 thermostat, not working..

if you cross the two wires and you see a slight spark and heat comes on, then the problem is in the thermostat, if not then problem is at furnace it self.

Posted on Apr 26, 2009

  • 3 Answers

SOURCE: Trouble Installing Hunter Brand Thermostat

on the back of the packaging for the HUNTER MODEL 44155C it states that it is not compatible with heat pumps

Posted on Apr 29, 2009

  • 49 Answers

SOURCE: I replaced my old mercury thermostat with a ct87k

the two wires are hooked to the baseplate at the R terminal and the W terminal. there may be a switch somewhere on thermostat for electric or gas heat. make sure its in gas mode. make sure batteries are fresh and put in correctly in regards to polarity. make sure furnace is on when doing any settings with the thermostat. make sure themostat is set to "heat". make sure themostat is calling for heat (turn way up to be sure its doing that) . check the troubleshooting guide that came with the new thermostat.

Posted on Oct 27, 2009

billyvangogh
  • 108 Answers

SOURCE: Replaced mercury thermostat w/Honeywell CT87K - doesn't work!

You need a specific thermostat for a Wall Furnace it is a Millivolt Thermostat and not a 24v standard thermostat....usually it will work anyway however if the powerpile (generator produces millivolts from the pilot light) is weak it may not be producing enough...or the Pilot light may be dirty and lazy...won't produce enough millivolts ...or you can have bad or dirty contacts or connections....or a combination of any of the above.....a 24v Thermostat and particularly a non-mercury thermostat has too much resistance in it for a millivolt system....as your Wall Furnace (other than the fan) runs on less than 1 volt

Posted on Oct 31, 2009

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1 Answer

When I turn my electric furnace on the contacter won't engage but fan on works and so does the a/c. still heater won't operate?


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Outside heating unit runs all the time


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The limit switch or rollout switch is usually open or bad.
The furnace board is seeing that one of those switches is open, so it brings the blower on to try to get the heat out of the combustion chamber area, so the switch will close. But if the switch is bad and won’t close, the furnace board will keep the blower running continuously.

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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

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No heat after installing honeywell thermostat H8110U


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Dec 07, 2009 | Honeywell Electronic Programmable...

3 Answers

Replaced mercury thermostat w/Honeywell CT87K - doesn't work!


You need a specific thermostat for a Wall Furnace it is a Millivolt Thermostat and not a 24v standard thermostat....usually it will work anyway however if the powerpile (generator produces millivolts from the pilot light) is weak it may not be producing enough...or the Pilot light may be dirty and lazy...won't produce enough millivolts ...or you can have bad or dirty contacts or connections....or a combination of any of the above.....a 24v Thermostat and particularly a non-mercury thermostat has too much resistance in it for a millivolt system....as your Wall Furnace (other than the fan) runs on less than 1 volt

Oct 31, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

I replaced my old mercury thermostat with a ct87k and it will not turn on. I have tried several so they surely are not defective. Hooked my old one back up and the furnace works. only 2 wire supply on a...


the two wires are hooked to the baseplate at the R terminal and the W terminal. there may be a switch somewhere on thermostat for electric or gas heat. make sure its in gas mode. make sure batteries are fresh and put in correctly in regards to polarity. make sure furnace is on when doing any settings with the thermostat. make sure themostat is set to "heat". make sure themostat is calling for heat (turn way up to be sure its doing that) . check the troubleshooting guide that came with the new thermostat.

Oct 27, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

Accuracy


I believe if you take the outer ring off you will see a small resitance strip that is called the heat anticipator. You should see a small pointer that can be moved one direction or another This will adjust for your heat and cooling override.This will tell the furnace to shut off at the temperature you have it set at.

John

Oct 03, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

2 Answers

My honeywell ct87K thermostat will not turn the heater on


On your thermostat - R is the power in terminal. Y is the cooling out. W is the heating out. (G is fan out). It does not matter which wire goes to R, the other should go to W - if no heat with a call, the thermostat is bad.

Apr 17, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

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