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Product partially thawed / ice crystals on product; box warms during defrost
What is going on
Possible causes and checks for: product partially thawed / ice crystals on product; box warms during defrost.
Likely causes
- Over-defrosting (time termination too long, termination thermostat set too high or failed), fan running during defrost
Check in this order
- Use temperature/pressure termination with time as backup, fan delay, termination setpoint (~40°F coil)
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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.