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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Thermostat is not coming on we are in san antonio is there help out there for us


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Hello my name is Heath it will be my pleasure to assist you. Your thermostat may be on the blink and need to be replaced. But first lets try a couple things first take the batteries out of the thermostat and let the display go completely blank ( aprox. 5 mins.). While that is going blank go to the indoor air handler and turn the power off to it either from the switch or the inside panel box. Then once the display has gone blank turn the power back on and put the batteries back in. Then set the switch to cool and turn the temperature down and press hold and try it like that to see if it goes back to heat if it does then the thermostat is changing the temperature on its own and going into heat mode and will need to be replaced.

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Hello my name is Heath it will be my pleasure to assist you. Your thermostat may be on the blink and need to be replaced. But first lets try a couple things first take the batteries out of the thermostat and let the display go completely blank ( aprox. 5 mins.). While that is going blank go to the indoor air handler and turn the power off to it either from the switch or the inside panel box. Then once the display has gone blank turn the power back on and put the batteries back in. Then set the switch to cool and turn the temperature down and press hold and try it like that to see if it goes back to heat if it does then the thermostat is changing the temperature on its own and going into heat mode and will need to be replaced.

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If the screen is blanking out that means that the 24 volt power to the thermostat is being disrupted.
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.
Hope this helps.
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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