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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Posted on Jan 02, 2017

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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

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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

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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
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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.


Those normally do not fail, they have a mercury switch in them. However there is a cravat they have to be mounted level and up side up. If that is the way it is mounted then just replace it.

Dec 19, 2014 | Honeywell Ct87k Round Heat Only Manual...

1 Answer

Where does the power originate for my thermostat(I have a 2000 Nortron 10 k. electric furnace)


It is either powered from the furnace or outdoor unit , shut off power to each to determine . In rare cases there may be a 24 volt transformer connected to a lighting circuit .

Oct 02, 2014 | Honeywell CT87K - Round Thermostat Heat...

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Ct87k Honeywell Thermostat installation problems


what terminals did you attach the two wires to? You need a 24Volt signal so either RED and W white for heat or may need it on common depends how its wired need more info

Sep 16, 2017 | Heating & Cooling

1 Answer

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


IT SOUNDS TO ME LIKE EITHER YOUR SYSTEMS LOW VOLTAGE WIRING IS INCORRECT, MOST LIKELY @ THE FURNACE. IT COULD ALSO SIMPLY BE THAT WHEN THE TECHNICIAN THAT INSTALLED THE T-STAT AT START-UP DID NOT GO THROUGH THE INSTALLER SET-UP & CHOOSE THE CORRECT SETTINGS FOR A DUEL FUEL SYSTEM. TRY THIS " SET THE THERMOSTAT TO EMERGENCY HEAT, WAIT A MINUTE OR TWO & SEE IF THAT TURNED GAS FURNACE ON. IF SO THEN IT'S A SIMPLE FIX IN THE WIRING OR PROGRAMMING & NOT SOMETHING MAJOR! GOOD LUCK!

Nov 25, 2012 | Honeywell VisionPRO Thermostat TH8110

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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