Service diagnosis
40
Domestic air conditioner
10.3.7 The communication fault between IPM and outdoor PCB
Outdoor display:
ƵƾƵ)
LED1 flash 4 times
Method of Communication is detected by checking the IPM module and the outdoor PCB
Malfunction
Detection
Malfunction
Ŷ
The outdoor PCB broken leads to communication fault
Decision
Ŷ
The IPM module broken leads to communication fault
Conditions
Supposed
Ŷ
The outdoor PCB is broken
Causes
Ŷ
The IPM module is broken
Ŷ
Communication wiring disconnected
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or else
parts damage may be occurred.
1) Check whether Terminal CN23 and CN24 on the outdoor mainboard
CN10 and CN11 on IPM module
2) Check whether the connected wire between IPM and outdoor
Are they good?
Electrify the machine again and turn it
on, Check whether the voltage between
1 and 2 of Terminal CN23 is about DC5V,
Check whether the voltage between2
and 3 of Terminal CN23 is about DC15V,
Replace the outdoor mainboard with a new one
Replace the outdoor IPM module
with a new one.
YES
NO
NO
YES
Malfunction unsolved
1) Pull out and reinsert the terminals.
2) Replace connected wire
Summary of Contents for 1U35YEGFRA
Page 11: ...Piping diagrams Domestic air conditioner 4ˊPiping diagrams 9 ...
Page 12: ...Operation range 10 Domestic air conditioner 5 Operation range 10 0 21 27 35 20 40 60 43 20 40 ...
Page 37: ...Service diagnosis 37 Domestic air conditioner ...
Page 56: ...57 Do C omestic air ircuit Diagra conditioner ams r ...
Page 59: ...Removal Procedure 1 Removal of Outdoor panel RPHVWLF LU RQGLWLR ...
Page 60: ...Removal Procedure 2 Domestic Air Condition ...
Page 61: ...4 Removal Procedure 3 Domestic Air Condition ...
Page 62: ...Removal Procedure 2 Removal of Electrical Box RPHVWLF LU RQGLWLR ...
Page 63: ...Removal Procedure 3 Removal of Fan and Fan Motor RPHVWLF LU RQGLWLR ...
Page 64: ...Removal Procedure 4 Removal of fan motor brcked and partition RPHVWLF LU RQGLWLR ...
Page 65: ...Removal Procedure 7 Domestic Air Condition ...
Page 66: ...Removal Procedure 5 Removal of compressor and heat exchanger RPHVWLF LU RQGLWLR ...