Error Diagnosis And Countermeasure Flow Chart; Error Code 27 - Bosch AHUW036A2 Service Manual

Error handling instructions for Split outdoor unit
2.6 Error code 26
Display
code Title Cause of error
26 DC • Compressor
compressor starting
position failure
Table 11 Error code 26
2.6.1

Error diagnosis and countermeasure flow chart

Is installation condition No ->
normal?
Yes
Are the resistance No ->
between each phase
and insulation
resistance of inverter
compressor normal?
Yes
Is compressor wire No ->
connection condition
normal?
Yes
Is inverter PCB No ->
assembly normal?
Yes
Recheck power and
installation condition
Table 12 Error diagnosis and countermeasure chart
14
Check point & Normal
condition
1. Check the connection of
comp wire "U,V,W"
2. Malfunction of
compressor
3. Check the component of
"IPM", detection parts
1. Check pipe clogging /
distortion
2. Check covering (Indoor /
Outdoor 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 inverter PCB assembly
U,V,W connector connection
condition
2. Check wire disconnection and
wiring
3. Check compressor terminal
condition condition (bad
contact)
--> Reassemble if abnormality is
found
1. Check inverter PCB assembly
IPM normality
--> Replace inverter PCB assembly
Split ODU – 6 720 817 722 (2015/06)