Bosch BMS500-AAU036-1AHCXC - High Condenser Temperature Protection (PC 0 A)

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Service Manual
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
8.6.12 High temperature protection of condenser (PC 0A)
Error Code PC 0A
Malfunction decision conditions
When the outdoor pipe temperature is more than 65°C, the system will stop. The system will operate
again when outdoor pipe temperature is less than 52°C.
Supposed causes
f Condenser temperature sensor (T3) faulty
f Dirty heat exchanger
f System leakage or blockage
Table 43
Troubleshooting:
Figure 78
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High temperature protection of
condenser
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Check whether the
condenser temperatureis
Higher than 65°C (149°F)
Yes
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Checkwhetherthe
resistance of condenser
temp. sensor is within normal
range as defined
in Appendix 1
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Replace the temperature sensor
No
No
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Check whetherthe outdoor
ambient temperatureis
higher than 50°C (122°F)
No
Stop the systemYes
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Check if the outdoor unit
is properly venlated
Yes
Ensure outdoor unit is
properly ventilated
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Checkwhetherthe heat
exchangeris dirty
No
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Cleanthe heat exchangerYes
Replaceoutdoor PCB
No
Check refrigerant level and
add as necessary
Check if the outdoor fan
is running properly
Follow troubleshoong steps outlined
in Secon 8.6.7. Outdoor fan speed
malfuncon (E8)
No
Yes
No
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Correct the connectionNo
Yes
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B
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Check the connection
between temperature
sensor and PCB.
Yes