Outdoor Unit Pcb Abnormality - Daikin FTKS20DVMW(L) Service Manual

Troubleshooting
4.8

Outdoor Unit PCB Abnormality

E1
Remote
Controller
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
120
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,
Caution
or parts damage may be occurred.
Turn on the power again.
Is LED A flashing?
YES
Check to see if the system is
grounded.
Grounded?
YES
Is the harness
broken?
YES
NO
NO
NO
SiENBE04-507A
Replace the outdoor unit
PCB (1).
Ground the system.
Zero-cross signal
abnormality. Replace the
outdoor unit PCB (2).
Replace the harness.
(R4563)
Service Diagnosis