Yes, a malfunctioning or improperly configured thermostat can indeed cause an air conditioner to freeze up. If a bad thermostat fails to cycle the compressor off properly, or if it keeps the indoor blower fan from running long enough to circulate warm air across the evaporator coils, the continuous cooling cycle will drop coil temperatures below freezing. Additionally, programmable thermostats with incorrect settings or failing internal temperature sensors can cause the system to run excessively long cycles, chilling the coils past the point where humidity can condense safely without turning into solid ice. Verification: Monitor thermostat cycle times and verify it shuts down correctly when the target temperature is reached.
1 votes
Marked as accepted