HVACopediaAll brands · General troubleshooting
Frosted suction line
What is going on
Possible causes and checks for: frosted suction line.
Likely causes
- Overcharge (charge must be exact)
- Liquid line flashing when float is remote (missing weight valve/cap tube restriction)
Check in this order
- Charge by weight, weight valve at evaporator inlet, insulate line between float and evaporator
More general guides
Take it to the job
All guides, error codes and tips work offline in the HVACopedia app.
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.