Installation Instructions Bosch IDS BOVB 18 | 27
Bosch Thermotechnology Corp. | 10.2020
Data subject to change
15.8 Fault Code Table
Code Fault Description (Sensor)
C3 The coil sensor is seated fault in cooling (T3)
E4 Temperature sensor fault (T3, T4, T5)
E5 High/low voltage protection
E6 DC fan motor fault (only for 48/60K model)
E7 Compressor discharge sensor is seated fault (T5)
E9 EEPROM fault
H0 Communication fault in main control chip
H5* 5 times (P2) protection in 100 minutes, system lockout
H8 Pressure transducer fault (PT)
P0 High module radiator temperature protection (TF)
P1 High pressure switch protection (HPS)
P2 Low pressure protection in cooling or heating (PT)
P3 Compressor over current protection
P4 High compressor discharge temperature protection (T5)
P5 Condensor coil temperature protection in cooling (T3)
P8 DC fan motor hurricane/typhoon protection
PH Low discharge superheat protection
F1 High pressure switch protection (HPS)
L0-L9 The IPM module protection
AtL Ambient Temperature Limited
System Protection Status Codes**
Forced operation mode
L Running indication under T3 limited condition
d Running indication under T5 limited condition
P Running indication under compressor ratio limited condition
F Running indication under TF limited condition
C Running indication under current limited condition
U Running indication under low voltage limited condition
A Running indication under return oil mode
dF Running indication under defrost mode
Table 13
* Fault requires hard restart
** If the fi rst digit shown on the control board LED is one of the following protection
codes (followed by two numerical digits which show the current compressor
frequency in Hz), the unit will continue to run but in a limited condition. The only
exception is when the system is in defrost mode, which only displays "dF" (without
any numerical digits following).
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