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Question About Honeywell Thermostat TH6220D
problems with Heat On flashing...

I am tring to use the hold button for a set heat temp of 74. after hours it will be only blowing cool air and not heat the screen says Heat On flashing. the manual says to check the furnance door is closed. Where is that so I can check it.

Asked by oscar on 01/09/2010 1  Answer

ManualsOnline posted an answer 14 years, 9 months ago

The ManualsOnline team has found the manual for this product! We hope it helps solve your problem. Get the Manual Here

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