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SiBE04-101
Troubleshooting
Service Diagnosis
117
4.26
Faulty Outdoor Unit PCB and Transmitting/Receiving Circuit
Remote Controller
Display
∗
Outdoor unit LED
Display
A
3
1 — 2 — 3 — 4 —
Method of
Malfunction
Detection
1. The proper program operation of the microcomputer is checked by the program.
2. Signals transmitted from the outdoor unit to the indoor unit are received by the outdoor unit itself in
indoor unit -outdoor unit signal transmission mode, and proper receiving of the signals by the indoor
unit is checked.
3. Existense of the zero cross signal.
Malfunction
Decision
Conditions
1. When the microcomputer program does not function properly.
2. When the signals transmitted from the outdoor unit to the indoor unit are received by the outdoor unit
itself in indoor unit-outdoor unit signal transmission mode, but not properly.
3. When the zero cross signal is not detected over 10 seconds.
Supposed Causes
Display disabled by faulty power supply.
Faulty transmitting / Receiving circuit in outdoor unit PCB.
Microcomputer program run-away due to an external factor.
∗
Noise
∗
Momentary voltage drop
∗
Momentary power failure, etc.
Faulty outdoor unit PCB.
SiBE04-101.book Page 117 Monday, October 15, 2001 3:08 PM