Error Code 43 - Bosch AHUW036A2 Service Manual

Error handling instructions for Split outdoor unit
2.12

Error code 43

Display
code Title Cause of error
43 High • Abnormal
pressure value of
sensor sensor (open
error / short)
Table 23 Error code 43
2.12.1 Error diagnosis and countermeasure flow chart
Is pressure sensor OK? No ->
Yes
Is sensor connected to No ->
PCB (inverter)
correctly?
Yes
After replacement of No ->
outdoor unit main PCB
(inverter) is the system
also abnormal?
Yes
• Replace
corresponding PCB
(inverter)
Table 24 Error diagnosis and countermeasure chart
24
Check point & Normal
condition
1. Bad connection of
connector PCB (inverter)
2. Bad connection high
pressure connector
3. Defect of connector PCB
(inverter) (open/short)
4. Defect of PCB (inverter)
1. Replace the pressure sensor
1. Connect sensor to PCB
(inverter) correctly
END
1
Fig. 21 HP sensor characteristics
[1] Pressure sensor
[2] High pressure sensor: 0~5 MPa, Vout 0.5~3.5 V
2
6 720 817 722-22.1I
Split ODU – 6 720 817 722 (2015/06)