There are icons flashing on the thermostat display
There are several internal timers which influence the thermostat’s operation. If a timer is preventing the equipment from turning on, the display icons which show the equipment is operating, will be flashing to indicate a
You get a system error message
Here are the possible system error messages and what they mean:
--The room air sensor reports that the room air temperature is above 150_F or below
E4 The memory has failed and the thermostat will return to the factory settings.
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