Table of Contents
2-10. E: 3A.X. Indoor unit communication circuit error (Indoor
unit)
Indoor unit
Indicator
outdoor unit
→ired remote controller (2-wire)
Detective actuator
Indoor unit controller PCB circuit
Forecast of cause
Check point 1. Check the connection of terminal
•
After turning off the power supply, check and correct as follows:
Indoor unit: Check the connection of the terminal between the remote controller and indoor unit,
or between indoor units and check if there is a disconnection or short of the cable.
Check point 2. Check the indoor unit main PCB
•
Check terminal voltage of CN2 (terminal 1—3) of UT↔-T→R↓Z2 (Communication kit) (for 18
model). Check voltage at CN12 of main PCB (terminal 1—2) (for 24 model) (Power supply for
remote)
If terminal voltage is DC 5 V (for 18 model) or DC 12 V (for 24 model), remote controller failure
(Control PCB is OK).
If terminal voltage is DC 0 V, main PCB failure (Remote controller is OK).
NOTE: In case of re-installation is done due to removed connector or incorrect wiring, turn on the
power again.
2-10. E: 3A.↓. Indoor unit communication circuit error (Indoor unit)
Operation indicator
Timer indicator
Economy indicator
Error code
End
Continuous flash
Refer to
"Error code table (Outdoor unit)"
→hen the indoor unit detects the configuration of remote
controller group abnormal or the indoor unit detects lack
of the primary remote controller
Terminal connection abnormal
→ired remote controller failure
Indoor unit main PCB defective
- (03-24) -
3 time flash
10 time flash
E: 3A
on page 03-4
2. Troubleshooting with error code
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