Honeywell energypro t8665e User Manual

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Heating does not 

come on.

The thermostat is part of a 

Demand Response event. 

No power to thermostat. 

System selection is not set 

to Heat. 

Heating setpoint is below 

room temperature.

If thermostat indicates SAVE, wait until 

energy saving event is complete. To 

cancel energy saving event, if available, 

press and hold Run Program. 

Check that setpoint is above room 

temperature.

Check if circuit breaker is tripped—reset 

circuit breaker.

Check if fuse at fuse box is blown—

replace fuse.

Check if System switch at equipment is in 

Off position—set to On position.

Wait five minutes for System to respond 

(thermostat displays “Wait”).

Set System selection to Heat.