Bosch 15 SEER2 Series - E9 (EEPROM fault); HO (Communication fault in main control chip); E5 (High;low voltage protection); E1 (Communication error)

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Installation Instructions
Bosch 15 SEER2 Inverter Ducted Packaged Heat Pump - BTC 761701319 A (12.2022)
Error Code Description
E9 EEPROM fault
H0 Communication fault in main control chip
E5 High/low voltage protection
E1 Communication error
Table 30
If error codes E9/H0/E5 appear occasionally and after the system restarts
and runs normally after the power supply is re-established, no action is
necessary. Otherwise the system must be checked.
Figure 48
E9 (EEPROM fault)
Diagnosis Handling
Check whether the wiring is
connected normally
Yes
Restart to power on and
check whether it is normal
Reseat the wiring according
to wiring diagram
No
Reseat the wiring according
to wiring diagram
Replace the control board
Yes
The fault is
still present
No action is necessary. This fault
may be caused by strong
interference from the electric grid.
The system will recover when the
electric supply stabilizes.
No
Figure 49
H0 (Communication fault in main control chip)
Diagnosis
Handling
Yes
No action is necessary. This fault may
be caused by strong interference from
the electric grid. The system will
recover when the electric supply
stabilizes.
No
No
Yes
No
Check whether the wiring is
connected normally
Reseat the wiring according
to wiring diagram
Restart to power on and
check whether it is normal
Replace the control board
Replace the control board
Figure 50
E5 (High/low voltage protection)
Diagnosis
Handling
Yes
Check whether the power wires are
connected firmly and whether the
power supply wires diameter meets
the requirements from the
manufacturer
Yes
Restart to the power supply
and check whether the
compressor operates normally
Yes
Check whether there is
high voltage equipment
nearby
Yes
No
No
Replace the power supply
wires or connect the power
supply wires well
No
Replace the control board
No
Yes
Separate high-power
equipment and power
supply
No
Check whether the power
supply voltage is between
172-270V
Make sure the power
supply is within correct
range
Gauge and check whether
there is 380V DC between the
terminals P & N when the
compressor is running
Replace the control board
Figure 51
E1 (Communication error)
Diagnosis Handling
Check whether the wiring is
connected normally
Yes
Restart
to power on and
check whether it is normal
Reseat t
he wiring according
to wiring diagram
No
Replace the control board
of the outdoor unit
Yes
The fault is
still
You need do nothing. Perhaps this
fault is caused by accident, such as
strong interference form electricity
grid. System will recovery when
electricity grid is normal
No
Replace the control board
of the indoor unit