Question about Honeywell Programmable Thermostat Heater

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Heat will not turn on after I took it down to paint the wall

I think I might have put it together wrong or maybe shorted out the wiring but the heat or air will not come on. What do I do?

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If you didnot shut thew power off to your furnace before taking the t-stat off the wall then you probably shorted out the transformer in the furnace. the transformer supplies the system with 24v including the t-stat and can short out easily without sparks.

Posted on Nov 26, 2008

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My themorsat stop working,and I replaced the batteries.

see this causes and fix it. God bless you

Furnace Produces No Heat Possible Causes

Possible Repairs
  • Remove cover of thermostat and loosen screws holding unit to wall. Level the thermostat. Re-tighten screws and replace cover.
  • To adjust the heat anticipator, please see Heat Anticipator Adjustment.

  • Furnace Turns On and Off Frequently ("short cycling")Possible Causes
  • Dirty thermostat components
  • Heat anticipator not set correctly.

Possible Repairs

Sep 30, 2012 | Honeywell Programmable Thermostat Heater

1 Answer

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

1 Answer

My honeywell thermostat is asking for heat but the furnace won't turn on.

The first thing i would do is to make sure the t-stat is good.One easy way to do this is to remove stat cover then remove the screws that hold it to the wall. Disconnect t-stat wires making sure you note location. There should be a red and white wire for heat so put these two together and if your furnace comes on then the stat needs replaced. If it does not you need to check further to make sure you have power to your furnace.If the furnace does come on with these two wires together the furnace will run non stop. Hope this helps you. Thank you

Jan 12, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

How do I short my thermostat?

If you are asking how to bypass thermostat to make heat work then remove cover plate from t-stat and remove screws that hold base to wall. Disconnect wires to Rh and W and jumper together. This should make heater run non stop. Thank you.

Dec 25, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

I have a red and a blue wire coming out of the wall. I am not sure what I need to hook them up to in terms of O/B Y R G W. Help!

Hi, if this is just a forced air gas fired heat only heater, put the red wire on the R terminal and if no white wire, use the blue and connect it to w for heat. Normally for heat only, with 2 wires, they will be R for hot and White for heat. First, take the 2 wires and hold them together to see if the heater will start. If it is wired correctly at the unit it will fire up if all is working. Don't be afraid of shock, as this is very low voltage. Hold together and give it a couple of min. to see if it fires. If so connect as I have said. If not, replace the stat with a heat only stat that has only 2 terminals. If its a wall heater, you will need a heat only milivolt stat to replace the 24 volt stat you have. You can use it and it will work, but you may have problems in the future. Please rate me on this, and if you need more help just comment by my user name below. Keep me posted.
A/C, & Heating Contractor

Oct 21, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell Electric Baseboard Heater thermostat

You need to take the wires off the thermostat. And touch the red and white wire together. If the heater works then you need a new thermostat, if it does not work then you need a new ignitor. It all depends on the t-stat. Dont worry about the wires there are not enough volts to hurt you. It is milli volts so just touch them together and the unit should fire up

Apr 22, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

RTH2520B Honeywell Programable Thermostat wires

Hi soozankrayg!
Your problem should be pretty simple. (assuming that it is a typical 24volt system) you should hook up the black wire to the "RH" terminal and the white wire on the "w" terminal. Make sure that you turn off the power to the furnace at the breaker or the furnace itself before attempting this. The reason for this is that you can cause a short and either break the fuse at the furnace or burn up the circuit board. This can happen very quickly and is very common when a thermostat is removed.

Jan 28, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Dellllllllllluxe programmable thermostat chronotherm plus iv

Does your thermostat have batteries. What is the brand of furnace and model # . Does the furnace have a pilot light or is it electronic ignition. if you need heat you can take thermostat of wall and take wires that are labeled r and w and wire nut them together to see if furnace comes on. Make sure you turn breaker off to furnace first before you take thermostat off the wall. If furnace comes on after you turn power back on after you connect those two wires together then you will probally need new thermostat. If not you have a problem with your furnace. If you have any questions after you try this feel free to ask any more questions.

Jan 16, 2009 | Honeywell Programmable Thermostat Heater

3 Answers

Honeywell RTH3100C

You need to go into the installer setting to change it from heatpump to single stage gas heat.Go to if youve lost them.

Dec 13, 2008 | Honeywell Programmable Thermostat Heater

2 Answers

Mr. no tv 4 you

Don't quite understand the first post.
W is white or heat
Y yellow is cool (or B for blue) either will do
R is red or 24v
RC is the same as R, unless you have separate transformers for heat and cool, place a jumper from the 2 R's
Your old wires, though are 1 white and 1 black, usually this indicates line voltage. 120v or a milli-volt @.750v. Either case, you have the wrong type of thermostat for this application.

Jan 10, 2008 | Honeywell Programmable Thermostat Heater

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