Daikin VRVII Manual page 246

Troubleshooting by Indication on the Remote Controller
Remote Controller Display
P4
Applicable Models
VRVII, II-S, -WII and -WIII Series
Method of Error Detection
Resistance of radiation fin thermistor is detected when
the compressor is not operating.
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.
P4
" " will be displayed by pressing the INSPECTION
button.
Supposed Causes
Defective radiation fin thermistor
Defective inverter PCB
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