Question about Honeywell Programmable Thermostat Heater

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Chronotherm III Thermostat Completely Blank Screen, No Heat

The screen on the thermostat is completely blank. No reading at all and the heat is clearly not on because it's freezing in my house. I have changed the batteries and still nothing changed. Please help me. I live in CT and it is quite cold right now.

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One of two things either the disply has gone out which is likely as it is a common failure for that thermostat or your heating unit is not sending control power. the older chronotherms were system (24volt ac) powered the new hardware/box store units are battery powered. Either way display should not be blank with fresh batteries. to get heat on remove the thermostat jumper or twist together the wire from the R terminal with the wire from the W terminal. note the color of each wire for later reference, heat up house disconnect wires from each other and go purchase a new thermostat

Posted on Dec 18, 2008

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Posted on Jan 02, 2017

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The most likely cause is a safety switch on the secondary condensate drain line. This means that the primary drain line is almost totally clogged and that the condensate backs up enough to trip the condensate overflow switch. When it shut the system down (blank thermostat) this allows time enough for the condensate to slowly drain out and the safety switch resets itself. Clean out the primary condensate drain line (hook a shop vacuum to the line where it terminates outside and sucks the gunk out of it), this should take care of the problem. If it does not then you may have to get an a/c technician to professionally blow the line out from the air handler and possibly clean the condensate tray out in the air handler.
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One note: If the safety switch was properly installed then the system would shut off and never come back on until the drainage was corrected. Yours is obviously not installed properly.

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There are a few things that cause this:

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