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
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jan 11, 2011 | Honeywell Heating & Cooling
Dec 14, 2010 | Honeywell Programmable Thermostat Heater
Sep 22, 2010 | Honeywell Programmable Thermostat Heater
Aug 13, 2010 | Honeywell CT500 Digital Heat / Cool Manual...
Feb 28, 2010 | Honeywell Programmable Thermostat Heater
Oct 18, 2009 | Honeywell Electronic Programmable...
Sep 02, 2009 | Honeywell Programmable Thermostat Heater
Jun 25, 2009 | Honeywell Electronic Programmable...
Apr 06, 2009 | Honeywell TH4210D1005 Heater
Jan 25, 2009 | Heating & Cooling
Jun 29, 2016 | Honeywell Programmable Thermostat Heater
Apr 27, 2016 | Honeywell Programmable Thermostat Heater
1,463 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: