Outdoor Unit Pcb Abnormality - Daikin FLKS25BVMB Service Manual

SiBE05-513A
4.8

Outdoor Unit PCB Abnormality

E1
Remote
Controller
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
Service Diagnosis
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.
The microprocessor program runs out of control.
The zero-cross signal is not detected.
The microcomputer is out of control due to external factors.
Noise
Momentary voltage drop
Momentary power failure, etc.
Outdoor unit PCB defective
Broken harness between PCBs
Be sure to turn off power switch before connect or disconnect connector, Be sure to turn off power switch before connect or disconnect connector,
Caution Caution or parts damage may be occurred. or parts damage may be occurred.
Check the indoor and outdoor unit
Turn on the power again.
model numbers.
Indoor unit and outdoor unit Is LED A flashing?
matched?
YES YES
Check the code numbers
(2P01234, for example) of the Check to see if the system is
indoor and outdoor unit PCB with grounded.
the Parts List.
Grounded?
Matched compatibly?
YES
YES
Is the harness
broken?
YES
NO NO
NO NO
NO
Troubleshooting
Match the compatible
Replace the outdoor unit
models.
PCB (1).
Ground the system.
Change for the specified
PCB (1) or (2).
Replace the indoor unit
PCB (1) (or the outdoor unit
PCB).
Zero-cross signal
(Q0347)
abnormality. Replace the
outdoor unit PCB (2).
Replace the harness.
(R4563)
89