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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703103 A (11.2022)
13.7 Fault Code Table
Outdoor Control Board Code Fault Description (Sensor)
C3 The coil sensor is seated fault in cooling (T3)
E4 Temperature sensor fault (T3, T4, T5, Th, T3L)
E5 High/low voltage protection
E6 DC fan motor fault
E7 Compressor discharge sensor is seated fault (T5)
E9 EEPROM
H0 Communication fault in main control chip
H5* 5 times (P2) protection in 100 minutes, system lockup
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 typhoon protection
PH Low discharge superheat protection
F1 High pressure switch (HPS) fault
L0-L9 IPM module protection
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 model
dF Running indication under defrost model
Table 19
* 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).
Indoor Unit Board LED Codes
Number of fl ashes Description
Always ON Normal
1 Dehumidifi cation mode active
2 Reserved
3 Anti-cold air function active
4 Temperature sensor fault (T1)
5 Temperature sensor fault (T2)
6 Communication error
Table 20
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