Question about Honeywell Programmable Thermostat Heater

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Honeywell CT3611 thermostat, not working..

Programable thermostat, old forced air furnace, works well, was just cleaned for winter. This morning, no heat, flipped the breaker, messed with thermostat, heat back on. This evening, the same thing.

Took off the thermostat, tryed to trip blower with R and G wires, nothing.
Any ideas?

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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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This model of Honeywell thermostat uses the 24v from the unit to power it. One of three things must have happened.

1. You have lost power to the furnace, therefore no power to thermostat.
2. You only have 4 wires hooked up on the thermostat and not 5. A lot of older homes had just 4 wire running to the thermostat, which will not work for this thermostat. You should have a wire connected to the (C) or (B) terminal on the thermostat, which ever one they have, I can't remember off hand. These are the Common terminals. They have to have the common from the furnace 24v power to operate.
3. Faulty thermostat, which will obviously have to be replaced.

Hope this helps and gets you to cooler days!

Jun 28, 2012 | Honeywell Heating & Cooling

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I have a coleman evcon gas furnace I want to change the termostat to a programmable thermostat I don't know where the wires hookup we have four wires red,white,yellow,green. I have a honeywell RTH230b...

The thermostat has terminals which are marked for color, R = red, W = white, Y =yellow, G =green. There should be a jumper between Rh and Rc, Hook the red to Rh.

Jan 01, 2010 | Coleman Propane Forced Air Heater...

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Thermostat says -ac and my air condition will not work

is this a honeywell programable stat/ the ac means there is no 24v power coming to the stat from the systems transformer, check your furnace breaker or the switch on the side of the furnace

Jul 29, 2009 | Heating & Cooling

1 Answer

Wc wiring on thermostat

sounds like you have a heat pump the w2 on old thermostat is for a second stage heat. If you can give me a little more information on type of system you have (forced air furnace with heat/cool, Heat pump or boiler)? How many wires are on old thermostat? Is it a no programmable or programmable? How old is the furnace?

Jan 17, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

My furnace works intermittently.

You may have a dirty flame sensor. There are a number of other possible causes as well. Rheem/Ruud/Weatherking furnaces also have problems with the connection on the blower deck.
The flame sensor sometimes must be bypassed around the MOLEX CONNECTOR in the deck due to humidity.
Hope this helps.

Jan 14, 2009 | Honeywell Programmable Thermostat Heater

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Good morning I have a honeywell programable thermostat and when I bought the house there was no instruction booklet. The heat is shutting off at night The furnace guy is coming sometime today and...

Mebnme, is right, manually setting your therm and holding hold, will override any pre-setting program. Also go to honeywell website, order a manual and program your therm yourself, what model do you have?

Dec 06, 2008 | Heating & Cooling

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I have amanual honey well and I want to change it to a programable honeywell but the two wires on the manual thermostat are not labeled, so I don't know where to connect the wires to in the new thermostat

Wires for thermostat control circuits are normally color coded. Check for proper connections at the furnace and connect the same colored wires that you find at the furnace to the like lettered terminals on the new thermostat. R to R, W to W , Y to Y , ans G to G. R is for power to the thermostat, W is for heating, Y is for cooling and G is for furnace fan operation.

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