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My Honeywell DT92E is reading 10C hotter than the room temperature & even when I raise the setting to 35C it still does not switch the heating on. It has worked fine for 2 years until now

I have read all the forums, got the full manual, checked the installer mode is correct but still nothing. Its 18C in the room but the DT92E thinks it is 28C and even with the temperature set at 35C it does not switch on the heating. ECO is off, setting are correct. It has lost communication several times with the control box a ST9420C after no previous issues!

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My thermostat is set on 68 degrees and it shows room temperature is 68, but the furnace still kickson, Honeywell said it has a 1 degree difference. so what's the problem then?


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You can further reduce the number of furnace start and stops by increasing the offset to 2 degrees. This would work like this when the t-stat is set to 65 degrees and the room is cool:

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Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor
Please be kind when rating, as I know you will be. If you have anymore questions, leave them in the comment box so I can check in when I can get to them. Thank you for using Fixya.com

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