Applicable Systems
VRV IV-S
Symptoms
The air conditioner reports a defrost cycle fault. The defrost function is not operating correctly in heating mode.
Possible Causes
- Defrost sensor fault or mispositioned
- Reversing valve not switching for defrost
- Defrost timer or algorithm error
Troubleshooting Steps
- Step 1: Check the defrost sensor operation
Sensor reads the correct temperature - Step 2: Verify the reversing valve switches for defrost
Valve switches correctly - Step 3: Check the defrost timer and algorithm parameters
Parameters are correct
How to Reset
To reset: Repair the defrost system, then clear the fault.
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Source: Daikin Air Conditioner Service Manual, Daikin Industries Ltd.
Category: HVAC Residential
Published: 2026-09-29
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