Applicable Systems
VRV IV-S
Symptoms
The air conditioner reports a compressor locked rotor. The compressor motor cannot start and is drawing locked rotor current.
Possible Causes
- Mechanical seizure from liquid refrigerant floodback
- Bearing failure in the compressor
- Compressor internal damage
Troubleshooting Steps
- Step 1: Check for liquid refrigerant in the compressor
Crankcase heater is functional - Step 2: Test the compressor for mechanical freedom
Compressor rotates freely - Step 3: Measure locked rotor current during start attempt
Current is within expected range
How to Reset
To reset: Resolve the locked rotor condition, then reset the protection.
Comments (0)
Share your experience to help others facing the same problem.
Leave a Comment
Source: Daikin Air Conditioner Service Manual, Daikin Industries Ltd.
Category: HVAC Residential
Published: 2026-10-31
No comments yet. Be the first to share your experience!