Bosch BMS500-AAU009-0AHXXA - High Temperature Protection (P2)

Service Manual Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump | 41
Bosch Thermotechnology Corp. | 02.2018
Data subject to change
8.3.10 High temperature protection of IPM module or compressor top
diagnosis and solution(P2)
Error Code P2
Malfunction decision conditions If the sampling voltage is not 5V, the LED will display the failure.
Supposed causes
f Installation mistake
f Power supply problems.
f System leakage or block
f PCB faulty
Table 25
Troubleshooting:
Figure 38
For 18K,24K,
Yes
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Tighten the screws and apply
silicon grease.
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B
.
Replace the outdoor control PCB.
No
Check if the Fastening screws
on the PCB and IPM radiator
are fixed tightly.
For other models,
Check if the air flow systems
of indoor and outdoor units
are obstructed?
Clear up the air inlet and outlet or the heat
exchanger of indoor and outdoor units.
Yes
No
Yes
Yes
Turn off the power supply and turn
it on 10 minutes later.
Check if the temperature
of compressor Top
Is more than 90°C？
No
Check if the refrigerant
system
is normal?
Repair the refrigerant
system .
Replace the outdoor control PCB.
Yes
Check if all the connections,especially
the connection of OLP (Over Load
Protector) sensor is good.
Correct the connection.No
Measure the resistance
between the two ports of
the OLP. Is it zero?
Yes
Replace the OLP.No
Replace the outdoor control PCB.Yes
No