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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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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Have a ct87k. Got power at wall. Plug t-stat nothing.switches are both off for gas.


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Dual heat system, honeywell thermostat, auxiliary heat won't turn on


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Just purchased and installed a Honeywell programmable thermostat (RTH6350) and for some reason, the furnace just decided to turn on, and it won't turn off - even when i turned the thermostat off!!!...


I would recheck your wiring..... Shut the furnace off at the breaker or SSU.... Then get a pen and pad and write down the color of wires and where it is connect on the Terminal strip at the furnace..

Example: Red wire hooked to R terminal etc They should all match up with the subase of the new Thermostat.
Then go up to the thermostat and Check and make sure the colors match what you have wired at the furnace. R= Power W=Heat G=Fan Y=Cooling C=Common

There are two possible ways the heat could be power on all the time..... You have the white wire or W wire wired to G and the thermostat is set to Fan ON... or the insulation on the R wire and W wire is split and touching each other or they got pinched and are touching together which will make the furnace come on with out the thermostat controlling it..... Good Luck, Its is where I would start first.... there our other possibilitys the control board may of gone hay wire.....

May 22, 2011 | Honeywell Programmable Thermostat Heater

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...

1 Answer

Cannot get new thermostat to work


didn't wire up correctly or if purchased a digital one didn't set up correctly, look at the instructions and should tell you how to set t-tstat up or if you have to remove or move jumper.

Apr 23, 2009 | Heating & Cooling

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