Question about Honeywell Programmable Thermostat Heater

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Furnace not blowing heat

We have a a TH4210D set to 71 degrees but right now the furnace is blowing cold air.

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  • Anonymous Mar 14, 2014

    It comes on it only blows cold air

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  • Contributor
  • 11 Answers

Sounds like a thermal fuse

Posted on Dec 21, 2008

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Dip switch settings rthl2310


Check for cold air inside the wall behind the thermostat, a cold wall, and area that is getting hot or cold air blowing on the thermostat. Last, the heater may not be compatible with some digital thermostats. Honeywell Customer Care toll-free at 1-800-468-1502.

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Rth230b blows cold air when set on heat


If this is a gas fired furnace, their could be a manual limit needing to be reset...if you reset it, & it happens again, you need to call someone to check out the problem

Nov 25, 2013 | Honeywell Programmable Thermostat Heater

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Honeywell thermostats keep turning off and on and blowing cold air


Need to know the type of heat you have. If it is an air to air heat pump, with this cold weather, you are not going to get much heat out of it. It will feel cool (a little higher than room temperature). If the temps outside stay below 25 degrees, then switch it to Auxillary (Emergency ) heat.

Nov 25, 2013 | Heating & Cooling

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RTH2310b thermostat not heating to temperature set, I turn it off and back on, it runs few minutes then shuts off not heating to temp set on thermostat


All thermostats have a "Differential" setting that causes the thermostat to turn off early as an energy saving feature to blow all the hot air out before the furnace fan shuts down. On some stats, there is a switch on the back for setting this and some have a programming choice for setting this time. Others have no setting but normally start the heat about 2 or 3 degrees below the set-point and shut it off 2 degrees above. In this case it would be called a 5 degree differential. Look for these as described and adjust it up 2 degrees if found. Good luck.

Nov 09, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

The heater is not coming on. fan will blow cold air but does not heat up.


Assuming you have the T-stat set to the heat setting and set at least 10 degrees above room temperature and have the t-stat set to AUTo (If applicable) then the problem is with the actual heating unit. The T-stat merely turns the unit on.

Feb 02, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

I just installed a honeywell 5-2 progammable thermostate.. Everything is hooked up fine and I have my days, hours wake, sleep, leave...etc all set, but when it goes on.. for example, I have it set for...


You didn't include a model number, so it's hard to know for sure - but I'll take a stab at this one. Many of these t-stats have a programmable offset to reduce "hunting". This can be as little as 1 degree or more than 2 degrees.

This means if you set the offset to 1 degree and the room temperature to about 65 degrees, the furnace will heat the room until the t-stat registers a rising temperature of 66 degrees. The furnace shuts off and will not turn on again until the t-stat registers a falling temperature of 64 degrees. The average is 65 degrees, and prevents the furnace from starting and stopping numerous times instead of just once with the 1 degree offset.

You can further reduce the number of furnace start and stops by increasing the offset to 2 degrees. This would work like this when the t-stat is set to 65 degrees and the room is cool:

Room Temp Furnace
63 On
64 On
65 On
66 On
67 On
68 Off

The room is now warm and heat or furnace is off. The room begins to cool like below:

67 Off
66 Off
65 Off
64 Off
63 Off
62 On

With a 1 degree offset, the room temperature varies +/-1 degree (about 2 degrees total). With a 2 degree offset, the temperature about varies +/ -2 degrees (about 4 degrees total).

Also, when the thermostat shut the heat off, the heat that was made is delivered to the space instead of wasted by sending outdoors - so the room will get a little warmer even though no fuel is being burned. The same holds true at the other end. When the t-stat turn heat on, fuel is burned, but there's little heat until the source has reached the optimum temperature and then the heat is delivered to the space.

I hope this helps & good luck! Pleas rate my reply - thanks!

Jan 24, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

Furnace blows cold air


Sometimes the fans kicks in by time ---or by heat...even if the heat cycles dont starts . Is this gas or electric,, name brand,.... model # ect...ect..

Dec 12, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Day / Night HVAC is running cool air BUT the furnace is running 2


Strange. Does the thermostat control both the air conditioning units and the furnace. If not make sure the furnace thermostat is turned down to below 65 degrees.

Jun 29, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

The thermostat turns the heating unit off and the fan continues


check your furnace filter to make sure the furnace is not over heating. what brand of furnace do you have and how old is it?Have you changed filter to a different kind last time you changed it?

Jan 16, 2009 | Honeywell Programmable Thermostat Heater

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