Air Conditioner: Poor cooling, low suction, high superheat, warm evaporator
Poor cooling, low suction, high superheat, warm evaporator on a air conditioner: Possible causes and checks for: poor cooling, low suction, high superheat, warm evaporator.
Common causes of poor cooling, low suction, high superheat, warm evaporator
- Cap tube plugged (wax from overheated oil, burnout debris), crimped/bent tube, plugged filter-drier/strainer, undercharge
How to fix poor cooling, low suction, high superheat, warm evaporator: step by step
- Frost pattern on cap tube/drier (frost at restriction), suction pressure, compressor amps
- Replace tube with same length/ID plus new liquid line drier
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.