Pioneer LISAS-B-1403 Service Manual page 142

Troubleshooting
2.4.4.14. P5 malfunction
When condenser high temp. is more than 65°C, the unit will stop, and unit runs again when outdoor pipe
temp. less than 52°C.
P5 display
High temperature protection of
condenser
Check whether the
condenser temperature is
more than 65°C
Yes
Judge 1: Check whether the
outdoor ambient
temperature is higher than
50℃
No
Judge 2: Check whether the
heat exchanger is dirty
No
Judge 3: The refrigerant
pipe is blocked
140
Replace the temperature sensor
No
Check whether the
No
resistance of condenser
temp. sensor is correct
refer to the Appendix 1
Yes Stop the unit
Yes Clean the heat exchanger
Let the refrigerant out, then use the high
Yes pressure nitrogen or refrigerant to blow pipe,
vacuumize and charge the refrigerant again
Yes Replace outdoor main board
No
Electrical Control System