BGH BSBSIC24CTK Manual page 49

Troubleshooting
13. 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.
High temperature protection of condenser
Check whether the condenser temperature is more than 65°C
Check whether the resistance of condenser temp.
sensor is correct refer to the Annex 1
Replace outdoor main board
Clean the heat exchanger
Let the refrigerant out, then use the high pressure
nitrogen or refrigerant to blow pipe, vacuumize and
charge the refrigerant again
45
P5 display
No
Yes
Stop the unit
Yes
No
Replace the temperature sensor
Yes
Judge1: The outdoor temp. is too high
Judge 2: Check whether the heat exchanger is dirty
Yes
Judge 3: The refrigerant pipe is blocked
Replace outdoor main board
Yes
No
No
No