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The Honeywell RTH221B1021/U Digital heat does not come on

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Is this a new thermostat installation?

Posted on Dec 11, 2013

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We have a digital Honeywell Thermostat and it's not that old but we have the heat setting at 68 degrees and the inside temp is reading 71 and our fan doesn't seem to turn off.


Hi, Most all of the Honeywell t-stats have a temperature adjustment feature...also check the the cycle rate is the right one for your heating system... You will find all of this info in the manual for your t-stat...

Here is a tip that tells you how to get a manual for most any Honeywell productonline...

Manual Honeywell How to Find Honeywell Manuals

heatman101

Dec 08, 2010 | Honeywell Heating & Cooling

1 Answer

Can i use th5320u1001 on 2 stage compressor and 1 stage heat? tom roll , abe service company , bowling green,ky


Hi,
Yes, that t-stat has that capability...

http://www.pexsupply.com/Honeywell-TH5320U1001-The-FocusPRO-Non-Programmable-Digital-Thermostat-Premier-White-4956000-p

If you need the manual to get it set up then check out this tip...

Manual Honeywell How to Find Honeywell Manuals

heatman101

Sep 15, 2010 | Honeywell Electronic Programmable...

1 Answer

Replacing Round Honewell Mercury Thermostat


try to get one that is made for oil heat, the installation is easy only two wires, and the instructions make it easy.

Oct 23, 2008 | Honeywell Electronic Programmable...

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Honeywell T86A3006 24V Class 2 Round thermostat 8020


The honeywell tradeline thermostat would work as a direct replacement (no mercury in the new ones), however if your using just heaters and no cooling system off of it, you could Heat only thermostat from honeywell that would replace your unit as well. Both at available at Ace Hardware with the heat only unity being roughly 7 dollars cheaper.

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1 Answer

Honeywell therostat wiring help


Don't assume the wires at the thermistate are correct.

I had similar and had to go all the way back to the heat/AC controller board. I found the colors weren't attached per spec so was fighting the origional installation at the new thermistat.

Also some digital won't control mutizones proerly

Dec 15, 2007 | Honeywell Programmable Thermostat Heater

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