Bosch IDS BOVB60-20 - Troubleshooting Error Codes E7, E9, HO

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Installation Instructions
Bosch IDS BOVB20 Split System Heat Pump - BTC 761701316 C (02.2022)
WARNING: HAZARDOUS VOLTAGE
 When measuring resistance , make sure the unit is powered
off and wait 3 min before taking measurement.
Figure 60
E7 (T5 sensor not reading correctly)
Is the
resistance of T5 in the range
of Table 16?
Correct the location
Restart system
Refer to wiring diagram
for correct wiring
Yes
No
No
Yes
Yes
No
Is the location of the
T5 sensor wrong?
Are the
T5 and Tf sensors wired
correctly?
Replace T5 Sensor
Figure 61
E9 (EEPROM IC20 fault)
Is EEPROM IC20 chip
properly installed?
Power off and correct
the connection
Yes
No
Yes
No
Does EEPROM IC20
have poor contact?
Power off and correct
the contact
Replace control board
Figure 62
H0 (Communication fault in EEPROM IC14 chip)
Is EEPROM IC14 chip
properly installed?
Power off and correct
the connection
Yes
No
Yes
No
Does EEPROM IC14
have poor contact?
Power off and correct
the contact
Replace control board