Bosch IDS BOVB20 - Page 34

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Installation Instructions
Bosch IDS BOVB20 Split System Heat Pump - BTC 761701316 C (02.2022)
Figure 58
E5 (High low voltage protection)
Is the
high voltage power supply
≥270V?
Correct power
supply/call
utility provider
Replace control
board
Restart system
Yes
No
Yes
No
Yes
No
Correct power
supply/call
utility provider
Is the
high voltage power supply
≤172V?
Is the
voltage between P-N (CN3)
<310V?
Figure 59
E6 (Outdoor DC fan motor fault)
Is ODU
fan motor wire (CN3)
connection to control
board secure?
Secure connection
Power off and remove
blockage or replace
fan blade
Restart system
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Is the
fan blade damaged
or is foreign matter blocking
the fan?
Are
outdoor weather
conditions preventing the fan
from operating
normally?
Power off until
severe weather
conditions subside
Replace motor
Replace control board
Did the outdoor fan
motor fail?
Did the
control board fail?