Outdoor Unit Pcb Abnormality - Daikin CTXU25G2V1B Service Manual

SiBE12-908
2.16

Outdoor Unit PCB Abnormality

E1
Remote
Controller Display
Outdoor Unit LED A 5 5 5
A 7 5 5 (zero-cross abnormality)
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
Service Diagnosis
Detect within the programme of the microcomputer that the programme is in good running
order.
Detect input of zero-cross signal.
When the programme of the microcomputer is in bad running order.
Zero-cross signal can not be detected.
Out of control of microcomputer caused by external factors
Noise
Momentary fall of voltage
Momentary power loss
Defective outdoor unit PCB
Breakage of harness between PCBs
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Power on again
Dose the LED A
blink?
YES
Check to see that the machine is
grounded.
Grounded?
YES
Is harness in good
order?
NO
NO
NO
YES
Troubleshooting
Replace the outdoor unit
PCB.
Carry out grounding work.
Zero-cross signal is fault.
Replace the outdoor unit
PCB.
Replace harness.
(R9437)
125