Outdoor Unit Pcb Abnormality - Daikin FTKN09NMVJU Service Manual

Troubleshooting
4.9

Outdoor Unit PCB Abnormality

E1
Error Code
Method of Error
Detection
Error Decision
Conditions
Supposed
Causes
Troubleshooting
71
The system checks if the microprocessor is working in order.
The system checks 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
Noise
Momentary drop of voltage
Momentary power failure
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?
Blink
Check if the outdoor unit is
grounded.
Grounded?
YES
∗ Before you check the LED A,
cancel the standby electricity
saving function by starting fan
operation with the remote
controller.
∗ Wait at least for 7 sec. after
turning on the power.
Continuously ON or OFF
NO
SiUS041501E
Replace the outdoor unit
PCB (main PCB).
Ground the system.
Zero-cross signal
abnormality.
Replace the outdoor unit
PCB (main PCB).
(R21201)
Service Diagnosis