Power Supply Abnormalities Or Faulty Indoor Printed Circuit Boards - Daikin FTK25JV1NB Manual

Si-86.book Page 65 Friday, June 23, 2000 10:26 AM
SIE-86
5.9 Power Supply Abnormalities or Faulty Indoor Printed Circuit Boards(U4)
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Remote Controller
Display
Indoor unit LED
Display
Method of 1. The proper program operation of the microcomputer is checked by the program.
Malfunction 2. In indoor-outdoor signal communications, the indoor unit determines whether the outdoor unit receives
Detection
Malfunction
1. When the microcomputer program does not function properly.
Decision
2. When the indoor unit determines that the indoor unit does not properly receive signals transmitted by
Conditions
Supposed Causes
Troubleshooting
Service Diagnosis
U U U U 4 4 4 4
or
signals properly by detecting signals transmitted by the outdoor unit to the indoor unit.
the outdoor unit in indoor-outdoor signal communications.
Display disabled by fault power supply.
Faulty signal transmitting/receiving circuit in indoor printed circuit boards (1) and (2)
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).
Check voltage of AC power supply.
220 ~ 240V ±10%
Does the
NO
power supply have the rated
voltage?
YES
Check the varistor of the indoor
unit PCB.
YES
Is it damaged?
NO
Check the fuse of the indoor unit
PCB.
NO
Is there conductivity?
YES
Troubleshooting
Check the power supply, and
correct it if not proper.
Replace the varistor.
Replace the fuse.
Replace indoor PCB (1).
(RF003)
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