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E9: COMMUNICATION ERROR BETWEEN IDU AND WIRED REMOTE CONTROLLER
1. Error display:
IDU display: E9
2. Applicable models:
All indoor units
3. Error definition:
Communication error between IDU and wired remote controller normal operation
4. Possible causes:
• Abnormal power supply for the wired remote controller (Only 40VM900005)
• Communication wire is loose, shorted, or open circuit
• Damaged main board of IDU
• The wired remote controller is damaged
• The communication wire between the remote controller and indoor unit is too long
Power off
Check the status of
remote controller
power supply is
Ensure the correct
Check whether the communication
wire is loose, shorted, or open.
Is the touch screen wired controller
connected to the indoor unit? Is the correct power
supply for the controller connected?
Is the total length of communication
wire over 3937 feet?
Replace the wired remote
controller
communication wire
Shorten the
Reconnect the
communication wire
Error resolved
NO
Replace the main board of IDU,
and power on. Is the “E9” error eliminated?
YES
YES
YES
NO
NO
NO
YES
connected
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