Troubleshooting Si10-417
24 Service Diagnosis
5. Troubleshooting
5.1 Indoor Unit
5.1.1 Indoor Unit PCB Abnormality
Remote
Controller
Display
A1
Method of
Malfunction
Detection
Evaluation of zero-cross detection of power supply by
indoor unit.
Malfunction
Decision
Conditions
When there is no zero-cross detection in approximately
10 continuous seconds.
Supposed
Causes
Faulty indoor unit PCB
Faulty connector connection
Trouble
shooting
Note: Connector Nos. vary depending on models.
Control connector
Connector connection check
(note).
YES
Is it normal?
NO
Correct connections.
Replace PCBs.
(R1400)
Caution
Be sure to turn off power switch before connect or
disconnect connector, or parts damage may be occurred.
Model Type Connector No.
Wall Mounted Type
20/25/35 class
Terminal strip~Control PCB
Wall Mounted Type 50/60/71
class
Terminal strip~Control PCB
Ceiling Embedded Duct Type Terminal strip~Control PCB
Duct Connected Type Terminal strip~Control PCB
Floor / Ceiling Suspended
Dual Type
S37
Floor Standing Type Control PCB : S7, S201, S203
Power Supply PCB : S8, S202, S204
Si10-417.fm Page 24 Wednesday, September 22, 2004 6:38 PM
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