HVACopediaAll brands · Refrigeration troubleshooting
Ice on lower fins, airflow blocked
What is going on
Possible causes and checks for: ice on lower fins, airflow blocked.
Likely causes
- Melt water refreezing before draining (TD, drain slope, drain heater)
Check in this order
- Drain pan heater/hot-gas loop under pan, drain line heater, drain slope
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Source: General HVAC service practice — verify per model. Written in our own words; check the manual for your exact model.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.