I F ...
Display will not
will not change
(Example: cannot set
the heating higher or
the cooling lower).
Heating will not
Check that the batteries are installed correctly and fresh.
Check if the thermostat is mounted and latched on the wallplate—mount and latch the
thermostat on the wallplate.
Check that the temperature setpoints are:
— heating: 40 to 90°F (4.5 to 32°C)
— cooling: 45 to 99°F (7 to 35°C).
Check that heat setpoint is above room temperature.
Check if the circuit breaker is tripped—reset the circuit breaker.
Check if the system switch at the equipment is in the Off position—set to On position.
Wait five minutes for the system to respond.
Set system switch to Heat.