Bosch IDS 2.0 Service Manual page 41

Service Manual
Limited Condition
Fault Code
Status code
P2/H5
C** P3
d** P4
L** P5
P8
PH
L0-L9
AtL
P**
|-
A
dF
Table 28
Fault code and system protection status table
** I f the fi rst digit shown on the control board LED is one of the following Limited Condition Status 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).
Bosch Thermotechnology Corp. | 07.2021
Fault Code Description
Low pressure protection.
Compressor over current protection.
High compressor discharge temperature (T5) protection.
Condenser coil temperature (T3) protection in cooling.
DC outdoor fan motor protection.
Low discharge superheat protection.
The IPM module protection.
Ambient Temperature Limited Condition.
Running indication under compressor ratio limited condition
Force Mode
Oil return mode
Defrost mode
Potential Cause
 Poor heat exchange on coil
 Fan motor failure
 Service valves not open
 TXV/EEV/filter drier blocked
 Under charged
 Poor heat exchange on coil
 Fan motor failure
 Service valves not open
 TXV/EEV/filter drier blocked
 Over charged.
 Control board or compressor issue
 Poor heat exchange on coil
 Fan motor failure
 Service valves not open
 TXV/EEV/filter drier blocked
 Over charged
 Poor heat exchange on coil
 Fan motor failure
 Service valves not open
 TXV/EEV/filter drier blocked
 Over charged
 Severe weather (fan running in standby mode due to
high wind)
 Poor heat exchange on coil
 Fan motor failure
 Service valves not open
 TXV/EEV/filter drier blocked
 Under charged
 Control board failed
 Compressor failed
 Abnormal pressure
 Ambient temperature beyond operating range
 Incorrect O/B thermostat setting
 T4 sensor fault
 Low temperature and low load
 Force button was pressed on outdoor unit, forcing
100% compressor capacity
 Long compressor operation time
 Outdoor coil freezes
Bosch IDS 2.0 | 41
Data subject to change