honeywell thermostat not working blank screen
The screen may also display as blank and unresponsive but that can indicate a dying battery so try to replace it first. Check incoming voltage - Using a DMM or VOM check for line voltage 120VAC at the power terminals to the aquastat ie.
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Turn thermostat down - Turn the wall thermostat all the way down so it is not calling for heat.
. How to reset honeywell thermostat. Power is on by finding 120VAc at the two Line-IN terminals L1 and L3 are typical markings. The thermostat flashing temperature on its screen even when the heat is working or the device randomly turns on and off is the other sign to look for.
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