Outdoor Unit Pcb Abnormality - Daikin J Series Service Manual

Troubleshooting
4.8

Outdoor Unit PCB Abnormality

4.8.1 20/25/35 Class
E1
Remote
Controller
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
89
The system follows the microprocessor program as specified.
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.
Defective outdoor unit PCB
Broken harness between PCBs
Noise
Momentary fall of voltage
Momentary power failure, etc
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Turn on the power again.
Is LED A blinking?
YES
Check to see if the outdoor unit is
grounded.
Grounded?
YES
Is the harness
broken?
NO
∗ Before you check the LED A,
cancel the standby electricity
saving function by operating
fan operation with the remote
controller.
∗ Wait at least for 7 sec. after
NO turning on the power.
NO
YES
SiBE041101
Replace the outdoor unit
PCB.
Ground the system.
Replace the harness.
Zero-cross signal
abnormality.
Replace the outdoor unit
PCB.
(R14186)
Service Diagnosis