Fault Codes And Limited Conditions Troubleshooting; C3 Troubleshooting - Bosch IDS 2.0 Service Manual

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12.3 Fault Codes and Limited Conditions Troubleshooting

WARNING:
 All electrical work must be carried out by competent and
suitably qualified, certified and accredited professionals
and in accordance with all applicable legislation (all national,
local and other laws, standards, codes, rules, regulations
and other legislation that apply in a given situation).

12.3.1 C3 Troubleshooting

LED display output:
Description:
Possible causes:
Table 29
Procedure:
Figure 16
1) See Section 13.4
Data subject to change
C3
T3 sensor is not reading correctly in cooling
 Wrong location of T3 sensor (common cause)
 Failed T3 sensor – sensor reading incorrect value (common cause)
 Failed T4 sensor
Yes
Is the location of T3
sensor wrong?
No
Yes
Did T3 sensor fail?1
No
Yes
Did T4 sensor fail?1
No
Replace control board
WARNING: ELECTRICAL HAZARD
 Power-off the outdoor units before connecting or
disconnecting any connections or wiring, otherwise electric
shock (which can cause physical injury or death) may occur
or damage to components may occur.
Correct the location
Replace T3 sensor
Replace T4 sensor
07.2021 | Bosch Thermotechnology Corp.
Service Manual