Fault Code And Limited Condition Descriptions - Bosch IDS 2.0 Service Manual

4 0 | Bosch IDS 2.0

12.2 Fault Code and Limited Condition Descriptions

Limited Condition Status codes are displayed when a condition exists that
could harm the unit. To protect itself, the unit continues to run, but with limited
compressor frequency. When these protection codes are visible, the unit is still
functioning, just not according to its normal logic. If condition worsens/persists, a
fault code will be displayed and the compressor will shut off . For Limited Condition
Status codes, no service is required. Service may be recommended for active fault
codes, see fault code troubleshooting section for more detail.
Limited Condition
Fault Code
Status code
C3
E4
U** E5
E6
E7
E9
H0
H8
F** P0
P1/F1
Table 27 Fault code and limited condition status table
** I f 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).
Data subject to change
Fault Code Description
T3 sensor is not reading correctly in cooling.
Temperature sensor fault
High/low voltage protection.
Outdoor DC fan motor fault.
T5 sensor not reading correctly.
EEPROM IC20 fault.
Communication fault in EEPROM IC14 chip.
Pressure transducer (PT) fault.
Control board is over-heated.
High pressure protection.
Fault codes are displayed when an abnormal condition exists that could harm the
unit. Fault codes cause the compressor to shut off and force the unit into standby
mode until the abnormal condition goes away. When the abnormal condition
ceases, the unit will restart and operate as normal. The only exception is H5 which
requires a hard restart. Service may be recommended for active fault codes, see
fault code troubleshooting section for more detail.
Potential Cause
 Wrong location of T3 sensor
 Failed T3 sensor
 Failed T4 sensor
 Temperature sensors failed
 Wrong wire connections of sensor
 Ambient temperature beyond system operation range
 Power supply ≥270V
 Power supply <172V
 Control board issue
 Motor failed
 Fan blade damaged or blocked
 Extreme weather conditions
 Electrical issue
 Wrong location of T5 sensor
 Wrong connection on control board of T5&Tf
 T5 sensor failed
 EEPROM IC20 poor contact
 EEPROM IC20 improperly installed
 Control board failed
 Pressure transducer wiring not secure
 Pressure transducer failed
 Poor heat dissipation
 Tf sensor failed
 Wrong connection on control board of T5&Tf
 Outdoor motor failed, causing control board to
overheat
 Poor heat exchange on coil
 Fan motor failure
 Service valves not open
 TXV/EEV/filter drier blocked
 Over charged
Service Manual
07.2021 | Bosch Thermotechnology Corp.