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Starved evaporator / low capacity
What is going on
Possible causes and checks for: starved evaporator / low capacity.
Likely causes
- Undersized valve, setting too low, high altitude not compensated, plugged inlet screen
Check in this order
- Adjust CW to raise low-side pressure, compensate altitude, clean screen
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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.