Daikin VRVII Manual page 242

Troubleshooting by Indication on the Remote Controller
Remote Controller Display
P1
Applicable Models
VRVII and -WII Series
Method of Error Detection
Imbalance in supply voltage is detected in PCB.
Error Decision Conditions
When the resistance value of thermistor becomes a value
equivalent to open or short circuited status.
Error is not decided while the unit operation is
continued.
"P1" will be displayed by pressing the INSPECTION
button.
Supposed Causes
Open phase
Voltage imbalance between phases
Defective main circuit capacitor
Defective inverter PCB
Defective magnetic contact switch
Improper main circuit wiring
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