Troubleshooting - Split Type Indoor Unit Si18-201
240 Service Diagnosis
1.5.8 Faulty Power Supply or Indoor Unit PCB (For FTK(X)50/60H,
CDK(X)25~60H)
Remote
Controller
Display
∗
or
U4
Indoor Unit LED
Display
A
3
B
∗
Note: No LED Display on FTK(X)25/35J Series.
Method of
Malfunction
Detection
The proper program operation of the microcomputer is checked by the program.
Malfunction
Decision
Conditions
When the microcomputer program does not function properly.
Supposed
Causes
"
Display disabled by fault power supply.
"
Microcomputer program is in abnormal condition due to an external factor.
∗
Noise.
∗
Momentary voltage drop.
∗
Momentary power failure, etc.
"
Faulty indoor unit PCBs (1) and (2).
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