Honeywell T8665C Owner's Manual - Page 47

Monitor LED is, Heat Pump Fault

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Symptom System on indicator- 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 Action Heating/cooling equipment turns on the fan when the equipment has reached the preset time or temperature. Wait a minute after seeing the or and then check the registers. The heat pump signaled the thermostat to indicate a problem. 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 69-1538

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47
69-1538
System on
indicator—
for heat;
for cool—
is lit, but no warm
or cool air is
coming from the
registers.
Heating/cooling equipment
turns on the fan when the
equipment has reached the
preset time or temperature.
Wait a minute after seeing the
or
and then check the registers.
Heat Pump Fault
Monitor LED is
lighted.
The heat pump signaled the
thermostat to indicate a
problem.
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.
Table 3. Troubleshooting. (Continued)
Symptom
Possible Cause
Action