Panasonic U-4LE1R8 Service Manual page 79

3. Mini VRF System Alarm Codes
P03 Compressor Discharge Temperature Error
1. Error Detection Method
• When the discharge temperature is over 106°C.
2. Error Diagnosis
1 Adjustment
to
1-1 Not additional refrigerant charged
refrigerant
charge
1-2 Tends to have insufficient refrigerant charge in the system.
2 Blockage in
2-1 Service valve inside the outdoor unit closed
refrigerant
circuit
2-2 Are the tubes clogged?
Is the outdoor unit's electronic control valve operating correctly?
2-3 (Check for debris clogging the electronic control valve, a problem
with the electronical coil and/or the control PC board.)
Is it observable difference in status of the dew or frost between
2-4
the strainer's primary and secondary sides?
3-39
Mini VRF SYSTEM
Trouble Diagnosis
Yes Additional
refrigerant charge
No 2-2
Yes Adjust the
refrigerant amount
No Replace CR board
Yes Open service valve
No 2-2
Yes Avoid clogging
No 2-3
Yes 2-4
Replace the
No
electronic control
valve
Yes Replace the strainer
No Replace CR board
3