Bosch IDS BOVA15 Installation Instructions Manual page 29

E5 (High/low voltage protection)
Is the
high voltage power supply
≥270V?
No
Is the
high voltage power supply
≤172V?
No
Check
PFC Module: power on
the unit, when the fan is running,
is the voltage between
P-N (CN3) <310V?
No
Restart system
Figure 44
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
Correct power
supply/call
Yes
utility provider
Correct power
Yes supply/call
utility provider
Replace control
Yes
board
E6 (Outdoor DC fan motor fault)
Is ODU
fan motor wire (CN3)
connection to control
board secure?
Yes
Is the
fan blade damaged
or is foreign matter blocking
the fan?
No
Are
outdoor weather
conditions preventing the fan
from operating
normally?
No
Is the motor
insulation resistance
>100KΩ?
No
Is the
resistance of two
windings (U2,V2,W2)
(CN32) >36Ω, and/or
the resistance between
compressor winding
and ground
>10MΩ?
No
Did the
control board fail?
No
Restart system
Figure 45
Installation Instructions
No Secure connection
Power off and remove
Yes
blockage or replace
fan blade
Power off until
severe weather
Yes
conditions subside
Yes
Replace motor
Yes Replace motor
Yes Replace
control board
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