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Service Manual
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
8.6.4 Outdoor temperature sensor (coil sensor T3,ambient sensor T4,
Compressor discharge sensor T5、indoor coil outlet pipe sensor T2B)
malfunction) (EC 52/EC 53/EC 54/EC 56/EC 50)
Error Code EC 52/EC 53/EC 54/EC 56/EC 50
Malfunction decision conditions If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure.
Supposed causes
f Improper / Incorrect Wiring
f Sensor faulty
f Indoor / Outdoor PCB faulty
Table 34
Troubleshooting:
Figure 57
Checkthe connections
betweentemperature
sensor and PCB.
the connections correct?
Correct theconnections.No
Yes
Yes Replace indoor or outdoor PCB.
Replace thesensor
Checkthe resistancevalue
of thesensorsvia Appendix 1
andAppendix 2
Is it normal?
No
Figure 58
f Outdoor room temperature sensor T4 is in open circuit or has short
circuited(EC 53)
f Compressor discharge temperature sensor T5 is in open circuit or has
short circuited(EC 54)
f Evaporator coil outlet temperature sensor T2B is in open circuit or has
short circuited(EC 56)
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