Panasonic U-4LE1E5 Service Manual page 127

4. Mini VRF System Alarm Codes
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
refrigerant
charge
1-2
2 Blockage in
2-1
refrigerant
circuit
2-2
2-3
2-4
5
Not additional refrigerant charged
Tends to have insufficient refrigerant charge in the system.
Service valve inside the outdoor unit closed
Are the tubes clogged?
Is the outdoor unit's electronic control valve operating correctly?
(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
the strainer's primary and secondary sides?
5 - 41
5 - 39
Mini VRF SYSTEM
Mini VRF SYSTEM
Trouble Diagnosis
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
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