Situational Troubleshooting; Led Display Is Blank - Bosch IDS 2.0 Service Manual

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12.4 Situational Troubleshooting

12.4.1 LED Display is Blank

LED display output:
Description:
Possible causes:
Table 47
Procedure:
Figure 34
1) See Section 13.8
Data subject to change
No fault code displayed
Nothing is displayed on the LED display, but there is high voltage power to the board
 Input voltage is supplied and removed frequently (within 3 min)
 Abnormal power input
 Abnormal wire connections
 Compressor/outdoor motor/control board failure
Is the Input voltage
Yes
Power off and wait at least 3
supplied and
minutes before powering on
removed frequently
(within 3 min)?
No
Yes
Is the power supply Make sure power supply is
beyond the normal
172V-270V range?
No
Yes
Is the wiring Refer to wiring diagram on
incorrect?
No
Unplug pressure transducer
from control board
Yes
Is LED working?
No
Unplug outdoor blower motor wire
Yes
Is LED working?
No
Is compressor
No
operating
normally? 1
Yes
Replace control board
within normal 172V-270V
range
the manual and correct it
Replace pressure
transducer
Replace outdoor blower
motor
Replace compressor
Service Manual
07.2021 | Bosch Thermotechnology Corp.