Bosch BOVA Series - H0 ( Communication Fault in Main Control Chip); E9 (EEPROM Fault); E5 ( High;Low Voltage Protection)

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Bosch IDS BOVA Installation Instructions
12.2016 | Bosch Thermotechnology Corp.Data subject to change
Error Code Description
E9 EEPROM fault
H0 Communication fault in main control chip
E5 High/low voltage protection
Table 21
When E9/H0/E5 appears occasionally, and the system restart to run normally after
power supply again, you don`t need to do anything. Otherwise, you need to check
the system.
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
Youneeddonothing.Perhaps this
fault is caused by accident, such as
strong interference form electricity
grid. System will recovery when
electricity grid is normal
No
Figure 59
H0 ( Communication fault in main control chip)
Diagnosis
Handling
Yes
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
5T: Replace the control board
5T: Replace the drive board
No
Yes The fault is still
The fault is still
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
3T: Replace the control board
5T: Reseat the communication
wire
Figure 60
E5 ( High/low voltage protection)
Diagnosis
Handling
Yes
Check whether the power wires are
connected firmly, whether the power
supply wires diameter meets the
requirements from the manufacture
Yes
Restart to the power supply
and check whether the
compressor operates normally
Yes
Check whether there are
high voltage equipment
nearby
Yes
No
No
Replace the power supply
wires or connect the power
supply wires well
No
Replace the drive board
No
Replace the drive board
Yes
Separate high-power
equipment and power
supply
No
Check whether the power
supply voltage is between
187-253V
Make sure the power
supply is within correct
range
Gauge and check whether
there is 380V DC between the
terminals P2 and P4 when
compressor is running
Figure 61