© Danfoss | Climate Solutions | 2023.09
AX452438944357en-000301 | 7
2 I Fault diagnosis
Abnormal running noises from compressor
Problem
Possible cause
Remedy
Fixation of compressor is loose
- Screwed connections have become loose
- Securing elements for screwed connections
missing
- Tighten the screwed connections and secure
them anew
- Silent blocks defective
- Replace silent blocks
Liquid shock
- Liquid refrigerant reaching the compressor
- Adjust / check expansion valve
Check refrigerant filling
Check evaporator fan
- Icing-up of the evaporator
- Oil shocks because of too much oil
- Check oil level
Check the dimensioning of pipes (gas velocity)
Replace worn piston rings
Capacity regulator (accessory)
- Switching on and off constantly / oscillating
- Check the control
- Defective
- Replace capacity regulator valve
V belt drive, increased noise
generation
- Belts vibrating excessively
- Check belt tension
Use tensioning roller / guidance roller
- Incorrect alignment of compressor and motor
- Check alignment and adjust anew