Question about Honeywell Programmable Thermostat Heater
Thermostat is showing -24 degrees and heating system is burning. The actual room temp is approx +22 degrees so the sytem is not switching off. How do I reset or has the thermostat broken?
Honeywell cm921 problem with red light flashing tenp not controling boiler can any one hel
Posted on Dec 15, 2009
Heya this is a manufacturing fault from honeywell them selves when it comes up -24 basically it needs to be replaced there is no way around in if you get in touch with honeywell they are generally good about it also if you provide them with the date code and model code they will be greatfull as it seems they have sent out a "bad batch". you locate this by:
A) Move the slide in to the off position
B) Press and hold i for 5 seconds
C) Unit will enter settings mode
D) Press and hold the i button and the + and ¿ button together
E) The unit will hold the relay on for 5 minutes and you can view by pressing the down arrow twice for model id/date code (ww/yy)
I hope this helps
Posted on Feb 12, 2009
Go to the furnace and switch the power on/off so that it resets itself, get back to me
Posted on Nov 12, 2008
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Posted on Jan 02, 2017
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