Error Code 22; Error Diagnosis And Countermeasure Flow Chart; Error Code 23 - Bosch AHUW036A2 Service Manual

Error handling instructions for Split outdoor unit
2.4

Error code 22

Display
code Title Cause of error
22 Max. C/T -Input Over
Current
Table 7 Error code 22
2.4.1

Error diagnosis and countermeasure flow chart

Is installation condition normal?
Yes
Are the resistance between each phase
and insulation resistance of inverter
compressor normal?
Yes
Is compressor wire connection
condition normal?
Yes
Is inverter PCB assembly 1 power
connection normal?
Yes
Is input voltage normal?
Yes
Is PCB assembly 1 normal?
Yes
Recheck power and installation
condition
Table 8 Error diagnosis and countermeasure chart
Check Point
1. Check the power source (230V 15%).
2. Check that the fan operation is right.
3. Check the current.
4. Check the install condition.
5. Check the CT sensor output signal.
8
Check point & Normal
condition
1. Malfunction of
Compressor
2. Blocking of Pipe
3. Low Voltage Input
4. Refrigerant, Pipe length,
Blocked
No ->
No ->
No ->
No ->
No ->
No ->
1. Check pipe clogging / distortion
2. Check covering (unit)
3. Check EEV connector assembly condition / normal
operation
4. Check refrigerant pressure
-> Reassemble or manage if abnormality found
1. Check resistance between each terminal of compressor
2. Check insulation resistance between compressor terminal
and pipe
-> Replace compressor if abnormality is found
1. Check connection between PCB assembly and bridge diode
(misconnection, disconnection)
2. Check wire disconnection and wiring
3. Check compressor terminal connection condition (bad
contact)
-> Reassemble if abnormality is found
1. Check connection between PCB assembly 1 and bridge
diode (misconnection, disconnection)
-> Wiring again if abnormality is found
1. Check L~N phase is 230V 15%
-> Check connection condition and wiring if power is
abnormal
1. Check PCB assembly 1 IPM normality
-> Replace inverter PCB assembly
Split ODU – 6 720 817 722 (2015/06)