Honeywell T8635L Owner's Manual - Page 43

Troubleshooting (Cont) Symptom Possible Cause Cooling does not come on. No power to the thermostat. System selection is not set to Cool. Cooling setpoint is above room temperature. 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. Heating/cooling equipment turns on the fan when the equipment has reached the preset time or temperature. Filter expired. Action 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 or and then check the registers. Refer to the Filter Indicator section. The red LED is lit. The heat pump signaled the Move the System switch to Em.Ht setting (multistage heat thermostat to indicate a problem. pump only). See Heat Pump Operating Instructions or call your local heat pump dealer for assistance. continued 43 69-1332-4