Bosch BMS500-AAU036-1AHCXC - Compressor Top Temperature Protection (PC 02)

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Service Manual
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
8.6.14 High temperature protection of compressor top (PC 02)
Error Code PC 02
Malfunction decision conditions If the sampling voltage is not 5V, the LED will display the failure.
Supposed causes
f Improper / Incorrect Wiring
f Over load protector faulty
f System leakage or blockage
f Outdoor PCB faulty
Table 45
Troubleshooting:
Figure 80
Checkifthe airflow system
of indoor andoutdoor units
areobstructed?
Clearupthe air inlet and outlet as well as the heat
exchangerofindoorand outdoor units.
Yes
No
Yes
Yes
Turn offthe power supply and turn
it on 10 minutes later.
Check if thetemperature
on top of compressor
Is more than 90°C (194°F)
No
Check if there is any
refrigerant leaking
Refrigerant leak should be repaired
and unit properly recharged.
Replacethe outdoorPCB.
Yes
Checkifall theconnection,especially
theconnectionofoverload protector
sensor is secure.
Correct theconnection.No
Measure theresistance
between thetwo portsof
theoverload protector.
Is it zero?
Yes
Replacethe overload protector.No
Replace theoutdoor PCB.
Yes
No