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E9: COMMUNICATION ERROR BETWEEN IDU AND CONTROLLER
1. Error display:
Display on wired controller: E9
2. Applicable models:
• Non-programmable controller: 40VM900002
• Programmable controller: 40VM900003
• Touch screen controller: 40VM900005
3. Error definition:
• Communication error between the wired controller and IDU
• Check the communication between the wired controller and the IDU
4. Possible causes:
• No address is set for the IDU
• The wired controller is not connected to the communication port of IDU
• Wiring of wired controller does not meet the design requirements
• The wired controller is damaged
• Main board of IDU is damaged
Power off
Does FE display on the
indoor unit connected to the
wired controller?
Do the communication
ports HA and HB of wired controller
connect to the communication ports
HA and HB of indoor unit?
Does the communication wire
meet the design requirement?
Are the terminals securely
connected?
Replace the wired
controller, and see if the
error remains.
Set address for the indoor unit through
the wired controller or remote controller,
and make sure the new address is
different from other indoor unit in the
system.
Connect the communication ports HA
and HB of the wired controller to the
communication ports HA and HB of the
indoor unit
Reconnect the wire and fasten the
crimping screws.
YES
NO
NO
NO
Problem resolved
NO
YES
YES
NO
YES
The 18AWG shielding wire can be used
as communication wire with maximum
length of 820 ft.
YES
Power off
Replace the IDU’s main control board
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