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Installation Instructions
Bosch 15 SEER2 Inverter Ducted Packaged Heat Pump - BTC 761701319 A (12.2022)
13.7 Fault Code Table
Outdoor Control Board Code Fault Description (Sensor)
AtL Ambient Temperature Limited T4 (heat pump)
C3 The coil sensor is seated fault in cooling(T3)
E1 Commuication error
E4 Temprature sensor fault(T3,T4,T5,Th,T3L,TF)
E5 High/Low voltage protection
E6 DC fan motor fault
E7 Compressor discharge sensor is seated fault (T5)
E9 EEPROM fault
F1 High pressure switch(HPS) fault
H0 Communication fault in main control chip
H5* 5 times (P2) protection in 100 minutes, lockup
H8 Pressure transducer fault (PT)
L0-L9 The IPM module protection(only for analysis)
P0 High module temperature protection (TF)
P1 High pressure protection (HPS)
P2 Low pressure protection in cooling or heating (PT)
P3 Compressor over current protection
P4 High T5 protection
P5 Condensor coil temperature protection in cooling (T3)
P6 IPM module protection
P8 DC fan motor hurricane/typhoon protection
PC Evaporator freezing protection
PH Low discharge superheat 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 20
* 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 21
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