What does error code 91 mean on Honeywell thermostat?

1 Answers

Write Your Answer

Error code 91 is a loss of communication between thermostat and equipment. This can be caused by power glitches, surges or other power related issues. The thermostat then eventually picks the signal back up and reestablishes contact.

No video Answer Now
Was this helpful?
Do you wish to get the latest heat pump news, technology, markets, and discounts? Subscribe Now!
Would love your thoughts, please comment.x