Error Code - Pioneer YN020GMFI22M2D Service Manual

8.4.2.12 P4 (Temperature protection of compressor discharge) diagnosis and solution.

Error Code

Malfunction decision
conditions
Supposed causes
Trouble shooting:
Temperature protection of
compressor discharge
Check whether the
compressor discharge temp. is
more than 115°C ?
No
Check whether
connection is right between
compressor discharge temp.
sensor and PCB according
to wiring diagrams?
Yes
Measure the resistance value
of compressor discharge
temp. sensor. If the value is
not normal is normal refer to
the Appendix 2?
Yes
Replace outdoor main PCB
No
Replace high pressure valve assy
8.4.2.13 P5 (High temperature protection of condenser) diagnosis and solution.
P4
When the compressor discharge temperature(T5) is more
than 115℃ for 10 seconds, the compressor will stop
restart till T5 is less than 90℃.
● Refrigerant leakage
● Wiring mistake
● The discharge temperature sensor faulty
● Outdoor PCB faulty
Check whether the
Yes
refrigerant is leak
No
the
No
No Replace the compressor discharge temp. sensor
Yes
Correct the wiring connection
and
Stop leaking and add refrigerant