Bosch ODU Split 8 - Error code 29

Error handling instructions for Split outdoor unit
Split ODU – 6 720 817 722 (2015/06)
20
2.8 Error code 29
2.8.1 Error diagnosis and countermeasure flow chart
Display
code
Title Cause of error
Check point & Normal
condition
29 Inverter
compressor
over
current
• 1~ODU:
inverter
compressor
input current
is 30A
• 3~ODU:
inverter
compressor
input current
is 24A
1. Overload operation (pipe
clogging/covering/EEV
defect/ refrigerant
overcharge)
2. Compressor damage
(insulation damage /
motor damage)
3. Input voltage low
4. ODU PCB assembly 1
damage
Table 15 Error code 29
Is installation condition
normal?
No -> 1. Check pipe clogging /
distortion
2. Check covering (outdoor unit)
3. Check EEV connector
assembly condition / normal
operation
4. Check refrigerant pressure
-->Reassemble or manage if
abnormality found
Yes
Are the resistance
between each phase
and insulation
resistance of inverter
compressor normal?
No ->
1. Check resistance between
each terminal of compressor
(0.188 7%
2. Check insulation resistance
between compressor terminal
and pipe (over 50 M)
--> Replace compressor if
abnormality is found
Yes
Is compressor wire
connection condition
normal?
No -> 1. Check PCB assembly 1 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
Yes
Is input voltage normal? No -> 1. Check U-V, V-W, W-U phase is
220~240 V 10%
--> Check connection condition
and wiring if power is abnormal
Yes
Is PCB assembly 1
normal?
No -> 1. Check PCB assembly 1 IPM
normality
--> Replace inverter PCB assembly
Yes
Recheck power and
installation condition
Table 16 Error diagnosis and countermeasure chart