Daikin VRVII Manual page 250

Troubleshooting by Indication on the Remote Controller
Remote Controller Display
PJ
Applicable Models
VRVIII-Q Series
Method of Error Detection
This error is detected according to communications with
the INV. PCB.
Error Decision Conditions
Make judgement according to communication data on
whether or not the type of the INV. PCB is correct.
Supposed Causes
Mismatching of type of PCB
Defective (or no) field setting after replacing main PCB
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