Honeywell T8665C EnergyPro Owner's Manual page 81

Symptom
System on
indicator—
(Si for heat;
for cool—
is lit, but no warm
or cool air is
coming from the
registers.
Heat Pump Fault
Monitor LED is
lighted.
Table 3. Troubleshooting. (Continued)
Possible Cause
Heating/cooling equipment
turns on the fan when the
equipment has reached the
preset time or temperature.
The heat pump signaled the
thermostat to indicate a
problem.
Wait a minute after seeing the (S )
or and then check the registers.
Move the System switch to Em. Ht setting
(heat pump only). See Heat pump
Operating Instructions or call your local
heat pump dealer or Energy Utility for
assistance.
47
Action
69-1538