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Installation & Operation Manual
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
BTC 761701311 C | 04.2020
Bosch Inverter Ducted Packaged Heat Pump 3 Ton | 25
Data subject to change
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Troubleshooting
