Error Diagnosis And Countermeasure Flow Chart; Error Code 29; Error Code 32 - Bosch AHUW036A2 Service Manual

2.7 Error code 27
Display
code Title Cause of error
27 DC • Compressor
compressor starting
position failure
Table 13 Error code 27
2.7.1

Error diagnosis and countermeasure flow chart

Is installation condition No ->
normal?
Yes
Is input voltage normal? No ->
Yes
Is AC input wire No ->
connection condition
normal?
Yes
Is compressor wire No ->
connection condition
normal?
Yes
Is PCB assembly 1 No ->
normal?
Yes
Recheck power and
installation condition
Table 14 Error diagnosis and countermeasure chart
PFCM module checking method
CAUTION: PFCM module number 4 and 5 pins are
internal short state.
Split ODU – 6 720 817 722 (2015/06)
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 that L-N phase voltage is
230 15% (1~)
2. Check that R-S-T-N phase
voltage is 380 15% (3~)
--> Check connection condition
and wiring if power is abnormal
1. Check L-N connection
condition
2. Check wire disconnection and
wiring
--> Reassemble if abnormality
found
1. Check PCB assembly U,V,W
connector connection
condition
2. Check wire disconnection and
wiring
3. Check compressor terminal
connection condition (bad
contact)
--> Reassemble if abnormality is
found
1. Check PCB assembly 1 PFCM
normality
--> Replace PCB assembly 1
Error handling instructions for Split outdoor unit
1. Set the multi tester to diode mode
2. Check short circuit between input signal pins which are placed below
PFC module
3. Replace PCB assembly 1 if it is short circuit between pins except
number 4, 5 pins.
17