Air Conditioner: Coil iced, airflow blocked, poor cooling, high box temp
Coil iced, airflow blocked, poor cooling, high box temp on a air conditioner: Possible causes and checks for: coil iced, airflow blocked, poor cooling, high box temp.
Common causes of coil iced, airflow blocked, poor cooling, high box temp
- Defrost not initiating (timer motor dead
- Wrong timer type/wiring)
- Heater or hot-gas solenoid failed
- Termination thermostat failed
- Too few defrosts
- Fins too tight for application
- High TD
How to fix coil iced, airflow blocked, poor cooling, high box temp: step by step
- Timer advance test
- Heater amps/continuity
- Solenoid coil
- Termination switch
- Defrost frequency/duration
- Compare wiring to timer type (time-time
- Time-temp
- Time-pressure)
If the unit shows an error code, look it up: Carrier Air Conditioner codes Goodman Air Conditioner codes KeepRite Air Conditioner codes Lennox Air Conditioner codes Trane Air Conditioner codes
Source: General HVAC service practice — verify per model. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.