Why is my TH1100DH/TH1110DH/TH1210DH showing an error message HI? What does it mean?

Last updated

2/22/22

HI = The ambient temperature is above 122F (50 degrees C). Remember it can take several hours for a newly installed thermostat to normalize to room temperature. If the room temperature is lower than 122F (50 degrees C) and the thermostat is still displaying HI replace the thermostat.

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