Bosch Climate 5000 Series Service Manual page 57

7.6.11 Top temperature protection of compressor or High temperature
protection of IPM module or High pressure protection diagnosis and
solution(PC 02)
Error Code
Malfunction decision conditions
Supposed causes
Table 40
Troubleshooting:
Check if the air flow system
of indoor and outdoor units
are obstructed?
No
Turn off the power supply and turn
it on 10 minutes later.
Yes
Check if the temperature of
compressor Top
Is more than 90
Yes
Check if the refrigerant
system
is normal?
Yes
Replace the outdoor control PCB .
Figure 56
Bosch Wall Mounted Ductless Split Air Conditioner / Heat Pump IDU-ODU - BTC 769102301 A (11.2022)
PC 02
For some models with overload protection, If the sampling voltage is not 5V, the LED will display the
failure.
If the temperature of IPM module is higher than a certain value, the LED displays the failure code.
For some models with high pressure switch, outdoor pressure switch cut off the system because high
pressure is higher than 4.4 MPa, the LED displays the failure code.

Installation mistake

Power supply problems

System leakage or block

Outdoor PCB faulty

Over load protector (OLP) faulty
Clear up the air inlet and outlet or the heat
Yes
exchanger of indoor and outdoor units .
Check if all the connection , especially
No the connection of OLP (Over Load
Protector) sensor is good .
Yes
Measure the
between the two ports of
the OLP. Is it zero ?
No
Repair the refrigerant
system .
No Correct the connection .
resistance
No Replace the OLP .
Yes Replace the outdoor control PCB .
Service Manual
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