Outdoor Unit Pcb Abnormality - Daikin CTX Series Service Manual

DAMA-SM-21-003

4.10 Outdoor Unit PCB Abnormality

E1
Error Code
 The system checks if the microcomputer is working in order.
Method of Error
 The system checks if the zero-cross signal comes in properly.
Detection
 The microcomputer program runs out of control.
Error Decision
 The zero-cross signal is not detected.
Conditions
 Defective outdoor unit PCB
Supposed
 Noise
Causes
 Momentary drop of voltage
 Momentary power failure
Troubleshooting
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
Turn on the power.
Error again?
NO
Check if the outdoor unit is
grounded.
Grounded?
YES
YES
NO
Troubleshooting
Replace the outdoor unit PCB
(main PCB).
Ground the system.
The cause can be external
factors other than malfunction.
Investigate the cause of noise.
65