Daikin FVKS25BVMB, Service Manual

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SiBE06-514A Troubleshooting
Service Diagnosis 93
4.9 Outdoor Unit PCB Abnormality
Remote
Controller
Display
E1
Method of
Malfunction
Detection
„
The system follows the microprocessor program to make sure it runs normally.
„
The system checks to see if the zero-cross signal comes in properly.
Malfunction
Decision
Conditions
„
The microprocessor program runs out of control.
„
The zero-cross signal is not detected.
Supposed
Causes
„
The microcomputer is out of control due to external factors.
Š
Noise
Š
Momentary voltage drop
Š
Momentary power failure, etc.
„
Outdoor unit PCB defective
„
Broken harness between PCBs
Troubleshooting
Check the indoor and outdoor unit
model numbers.
Match the compatible
models.
Change for the specified
PCB (1) or (2).
Replace the indoor unit
PCB (1) (or the outdoor unit
PCB).
(Q0347)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Indoor unit and outdoor unit
matched?
NO
YES
YES
Matched compatibly?
NO
Check the code numbers
(2P01234, for example) of the
indoor and outdoor unit PCB
with the Parts List.
Turn on the power again.
Replace the outdoor unit
PCB (1).
Ground the system.
Zero-cross signal
abnormality. Replace the
outdoor unit PCB (2).
Replace the harness.
(R4563)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Is LED A flashing?
NO
YES
YES
YES
Grounded?
NO
NO
Is the harness
broken?
Check to see if the system is
grounded.