Bosch AHUW036A2 Service Manual page 25

2.13 Error codes 52, 53
1
Inverter PCB
CH52
Fig. 22 Error codes 52, 53
1
2
3
CAN-PCB and Installerboard
Table 25 Error codes 52, 53
2.13.1 Error code 52
Display
code Title Cause of error
52 PCB • Checking the
communica communicati
tion error on state
between
main PCB
and inverter
PCB
Table 26 Error code 52
Is transmission LED No ->
(Yellow) of inverter
compressor PCB on?
Yes
Is transmission cable No ->
connected correctly?
Yes
Is main PCB normal? No ->
Yes
• Replace inverter
compressor PCB
Table 27 Error diagnosis and countermeasure chart
Split ODU – 6 720 817 722 (2015/06)
2
Main/ODU PCB
CH53
Situation
No communication between
INV-PCB and ODU-PCB
(380V / 3~units)
No communication between CAN-PCB does not receive
ODU-PCB and CAN-PCB
No communication between
Check point & Normal
condition
1. Generation of noise
source interfering with
communication
Is noise filter or fuse normal?
▶ NO: Replace noise filter or fuse
-or-
▶ YES: Replace inverter
compressor PCB
1. Re-connect transmission cable
1. Replace main PCB
3
CANboard
No Error
Error code that is sent to
Description Installerboard by CAN
CAN-PCB receives error
code from ODU-PCB but
Inverter-PCB does not
respond
signals from ODU-PCB
CAN-PCB does not send
signals to Installerboard
Error handling instructions for Split outdoor unit
Installerboard
??
Waiting time of
communication before
error is generated
52
53
55 ODU shuts down after 1~3
seconds from recognizing
CAN communication error
30 seconds
10 seconds
25