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Honeywell t87 wiring diagram - Heating & Cooling

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Posted on Jan 02, 2017

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SOURCE: What position does the small

The switch on the right side of the T87 is for the fan. Down is the auto position which will cause the fan to run only when needed. Up is the always-on position, used to circulate the air constantly. If you want to shut down all heating cooling associated with this thermostat you need to look at the switch on the left side of the stat. To the right is heating, center is OFF, and left is ac.

Posted on Dec 16, 2008

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Bought new thermostat model ct87k but old Honeywell model I have was hook up by black and white wire not red and white , so how do I hook up.


The two wire Honeywell T87 and CT87 is nothing but a switch in a control circuit. Wire color is not important at all. What is important is the TERMINAL DESIGNATION those wires are hooked to. Soooo....take the wire off of the sub base of the old stat terminal marked 'R' and attach it to the new sub base terminal marked 'R' and so on. Wire COLOR means nothing at all in your case.

Oct 04, 2014 | Honeywell CT87K1004 Round Heat Only...

1 Answer

Wiring a Honeywell V8043E for two zones


Honeywell posts pdf manuals.
Google seArch Honeywell V8043E .pdf
Include .pdf in search parameter to find manual with wiring diagrams.
http://www.forwardthinking.honeywell.com/related_links/water/5000_series/install/95c_10932.pdf

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Oct 26, 2012 | Honeywell V8043E1012 Zone Valve 3/4 Sweat,...

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I have a T87 that i was replacing, red with red, white with white none of the setting fron behind work, the thermostat started to smoke, i could not connect it, what to do?


It sounds to me like you may have a defective thermostat. I would check wiring to furnace cotrol board on furnace and see if its is wired differently.If at this time of year for heat only red and white should do it. Hope this helps. Thanks

Nov 12, 2010 | Honeywell Heating & Cooling

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My new honeywell T87N/T87K round is not turning on my heater


check for voltage then check connections sometimes the wire breaks and no power gets to the stat

Jan 06, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

What position does the small lever on the right side of the T87 Honeywell Round T-stat need to be in to be OFF ?


The switch on the right side of the T87 is for the fan. Down is the auto position which will cause the fan to run only when needed. Up is the always-on position, used to circulate the air constantly. If you want to shut down all heating cooling associated with this thermostat you need to look at the switch on the left side of the stat. To the right is heating, center is OFF, and left is ac.

Dec 14, 2008 | Heating & Cooling

1 Answer

I've replaced my very old (mercury) Honeywell thermostat with a new one (round, Model: YCT87K1011), but I can't get it to control the temperature. If I connect the two wires one way, the furnace comes on...


Hey John, man that ole T87 has been around for a hundred years and I have installed many of them, but I cant remember the letters on the wiring. Seems to me that it is R-W-Y, any way you will use the R and W. I have a t87 at home still in the box and I could wait till I got home to help you but Im sure its the R and W terminal. Dont forget to set the heat anticipator. Set it the same as the current value of your gas or oil valve.

Nov 06, 2008 | Honeywell Heating & Cooling

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vulcan bonaire comfort control External natural gas electronic ignition 2004. ISSUE: Fan blowing only cool air continuously. Forced to kill power to stop it. model is one of the following. MB514E,20E or 30E. Going by mech drawing parts list. i can confirm what type of sensors i have cleaned with very fine sandpaper. flame sensor PN 5441603SP and IGNITER ELECTRODE PN 5441602SP The fault code i see is described as the following. There are x4 LED's. Sequence Left to Right. LEGEND: 1 Flame Sensor 2 Pressure switch 3 OverTemp 4 Diag. R Red G Green S Solid Colour B Blinking LED Behaviour. In order 2RS & 4GS Until i hear ignition. 2RS & 3RB Duration: split second 2RB,3RS & 4GB Duration: split second 3RS & 4GB Duration: Until it has completed blinking x4 times. 3RS Duration 4 seconds Repeat last two mentioned behaviour. in my own opinion, as a safety feature, the unit thinks that it has overheated or is about to. so kills the gas and force feeding cool air to heating components to save it from frying. Does this mean i have fault 04 if so does this mean i may have a faulty igniter or flame sensor or maybe a faulty as described in the mech drawing SWITCH OVER TEMPERATURE 120 degrees celsius. Am i correct here? Is this the over temperature cut out switch? if no one can really pinpoint which part requires replacement, can you at least, in sequence advise which parts to purchase? so then ill just try my luck. i wonder how to properly test if flame sensor, igniter, over temp etc is faulty with a multimeter. do i just perform a continuity test. I wonder what other parts can i test related to this fault im getting.

Jul 22, 2018 | Vulcan Heating & Cooling

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