Bosch IDS BOVA60-15 - Troubleshooting E7 Error Code; Troubleshooting E9 Error Code; Troubleshooting H0 Error Code

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Installation Instructions
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
WARNING: HAZARDOUS VOLTAGE
 When measuring resistance , make sure the unit is powered
off and wait 3 min before taking measurement.
Figure 46
E7 (T5 sensor not reading correctly)
Is the
resistance of T3/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
T3 and T5 sensors wired
correctly?
Replace T5/T3 Sensor
Figure 47
E9 (EEPROM IC14 fault)
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
Figure 48
H0 (Communication fault in Main Control Chip)
Is the main control chip
properly installed?
Power off and correct
the connection
Yes
No
Yes
No
Does main control chip
have poor contact?
Power off and correct
the contact
Replace control board