Fujitsu AOUH18LMAS1, Руководство по обслуживанию

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2-10. E: 3A.X. Indoor unit communication circuit error (Indoor
unit)
Indicator
Indoor unit
Operation indicator 3 time flash
Timer indicator 10 time flash
Economy indicator Continuous flash
Error code E: 3A
outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4
Detective actuator
→ired remote controller (2-wire) →hen the indoor unit detects the configuration of remote
controller group abnormal or the indoor unit detects lack
of the primary remote controller
Indoor unit controller PCB circuit
Forecast of cause
Terminal connection abnormal
→ired remote controller failure
Indoor unit main PCB defective
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.
End
2-10. E: 3A.↓. Indoor unit communication circuit error (Indoor unit)
- (03-24) -
2. Troubleshooting with error code
TR
O
U
B
LESH
O
O
TI
N
G
TR
O
U
B
LESH
O
O
TI
N
G