Bosch IDS 2.0 User Manual

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Bosch IDS 2.0 Service Manual
07.2021 | Bosch Thermotechnology Corp.
Data subject to change
12.4 Situational Troubleshooting
12.4.1 LED Display is Blank
LED display output: No fault code displayed
Description: Nothing is displayed on the LED display, but there is high voltage power to the board
Possible causes:
 Input voltage is supplied and removed frequently (within 3 min)
 Abnormal power input
 Abnormal wire connections
 Compressor/outdoor motor/control board failure
Table 47
Procedure:
Figure 34
Replace control board
Refer to wiring diagram on
the manual and correct it
Yes
No
Yes
Power off and wait at least 3
minutes before powering on
Make sure power supply is
within normal 172V-270V
range
No
Yes
Is the Input voltage
supplied and
removed frequently
(within 3 min)?
Is the power supply
beyond the normal
172V-270V range?
No
Is the wiring
incorrect?
Replace pressure
transducer
Yes
No
Is LED working?
Replace compressor
No
Yes
Is compressor
operating
normally? 
Unplug pressure transducer
from control board
Replace outdoor blower
motor
Yes
No
Is LED working?
Unplug outdoor blower motor wire
1) See Section 13.8

Bosch IDS 2.0 Specifications

General

Brand	Bosch
Model	IDS 2.0
Category	Heat Pump
Language	English