Specifications

Troubleshooting SiUS12-928_A
115 Service Diagnosis
5.10 Outdoor Unit PCB Abnormality (24/32 Class)
Remote
Controller
Display
E1
Outdoor Unit LED
Display
A 1 2 3 4
Method of
Malfunction
Detection
Detect within the program of the microcomputer.
Malfunction
Decision
Conditions
The program of the microcomputer is in abnormal running order.
Supposed
Causes
 Noise
 Momentary fall of voltage
 Momentary power failure
 Defective outdoor unit PCB
Troubleshooting
(R7183)
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
YES
NO
NO
YES
Power on again
Check to see that the unit is
grounded.
Replace the outdoor unit PCB.
Carry out grounding work.
The cause can be external
factors other than malfunction.
Investigate the cause of noise.
Error again?
Grounded?