Honeywell T8635L User Manual page 43

Troubleshooting (Cont)
Symptom
Cooling does not come
on.
System on indicator—
for heat, for cool—
is lit, but no warm or cool
air is coming from the
registers.
"Filter" is displayed and
the green LED is lit.
The red LED is lit.
Possible Cause
No power to the thermostat.
System selection is not set to
Cool. Cooling setpoint is above
room temperature.
Heating/cooling equipment turns
on the fan when the equipment
has reached the preset time or
temperature.
Filter expired.
The heat pump signaled the
thermostat to indicate a problem.
Check that setpoint is below room temperature.
Check if the circuit breaker is tripped—reset the circuit
breaker.
Check if the fuse at the fuse box is blown—replace the fuse.
Check if the System switch at the equipment is in the Off
position—set to the On position.
Wait five minutes for the system to respond (thermostat
displays " Wait").
Set System selection to Cool.
Wait a minute after seeing the
registers.
Refer to the Filter Indicator section.
Move the System switch to Em.Ht setting (multistage heat
pump only). See Heat Pump Operating Instructions or call
your local heat pump dealer for assistance.
43
Action
or and then check the
continued
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