Fujitsu AOTG30KMTC, Руководство по обслуживанию, Страница: 64 / 199

2-13. E: 3A. 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: for 34 model
only)” on page 1
Detective actuator
Wired remote controller (2-wire) When 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
Wired 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 CN6 (terminal 1—3) of main PCB (Power supply for remote)
If terminal voltage is DC 12 V, 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
Tip
Depending on the connected remote controller type, following setting is required:
Connected remote controller DIP switch Jumper (JM9)
2-wire type
Factory setting: 2WIRE
2WIRE /3WIRE
JM9
Disconnected
3-wire type
2WIRE/ 3WIRE
Factory setting: 3WIRE
Connected
(Factory setting)
JM9
• 2-wire type remote main PCB
If the communication PCB is not connected and JM9 is disconnected, 3A error is displayed.
If the communication PCB is connected and JM9 is connected, the 2-wire remote controller does
not work.
If the DIP switch is 3-wire side, the 2-wire type remote controller does not work.
• 3-wire type remote main PCB
If the DIP switch is 2-wire side, the 3-wire type remote controller does not work.
2-13. E: 3A. Indoor unit communication circuit error (Indoor unit)
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2. Troubleshooting with error code
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