Outdoor Unit Pcb Abnormality - Daikin H Series Service Manual

Troubleshooting
4.8

Outdoor Unit PCB Abnormality

E1
Remote
Controller
Display
 The system follows the microprocessor program as specified.
Method of
 The system checks to see if the zero-cross signal comes in properly.
Malfunction
Detection
 The microprocessor program runs out of control.
Malfunction
 The zero-cross signal is not detected.
Decision
Conditions
 Defective outdoor unit PCB
Supposed
 Broken harness between PCBs
Causes
 Noise
 Momentary fall of voltage
 Momentary power failure
Troubleshooting
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Turn on the power again.
Error again?
NO
Check to see if the unit is
grounded.
Grounded?
YES
YES
NO
SiUS04-924_A
Replace the outdoor unit
PCB.
Ground the system.
The cause can be external
factors other than
malfunction.
Investigate the cause of
noise.
(R7183)
81