E5 Troubleshooting - Bosch IDS 2.0 Service Manual

4 4 | Bosch IDS 2.0

12.3.3 E5 Troubleshooting

LED display output:
Description:
Possible causes:
Table 31
Procedure:
If power supply is between 180 and 210 V, System
protection code U** will be displayed on the LED
screen. Frequency will be limited to 50 Hz or less.
Figure 18
Data subject to change
E5
High/low voltage protection
 Power supply ≥270V
 Power supply <172V
 Control board issue
Is the high voltage power supply
≥270V?
No
Is the high voltage power supply
<172V?
No
Is the voltage
between P-N (CN3)
< 310VDC?
No
Restart system
Yes
Correct power supply/call
utility provider
Yes
Correct power supply/call
utility provider
Yes
Replace control board
Service Manual
07.2021 | Bosch Thermotechnology Corp.