Applicable Systems
VRV IV-S
Symptoms
The air conditioner reports an electronic expansion valve fault. The EEV is not controlling refrigerant flow correctly.
Possible Causes
- EEV motor failure or binding
- EEV driver circuit fault
- EEV position feedback sensor fault
Troubleshooting Steps
- Step 1: Test the EEV motor for step response
Motor responds to all commands - Step 2: Check the EEV driver circuit output
Driver delivers correct pulses - Step 3: Verify the EEV position sensor reading
Sensor reports the correct position
How to Reset
To reset: Repair or replace the EEV, then clear the fault.
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Source: Daikin Air Conditioner Service Manual, Daikin Industries Ltd.
Category: HVAC Residential
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