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Troubleshooting from Remote Controller
NO DISPLAY ON WIRED CONTROLLER (PROGRAMMABLE AND NON-PROGRAMMABLE)
1. Error display:
No display (the screen does not light on)
2. Applicable models:
• Non-programmable controller: 40VM900002
• Programmable controller: 40VM900003
3. Error definition:
No display on wired controller
Check wiring between IDU and controller
4. Possible causes:
• Incorrect wiring between IDU and controller
• Wiring of wired controller does not meet the design requirements
• The wired controller is damaged
• The main board of IDU is damaged
Power off
NO
ports HA and HB of the
wired controller are securely connected
to ports HA and HB of the indoor unit.
YES
NO
Does the communication wire
meet the design requirement?
Reconnect the wire for ports HA and
HB, and securely fasten the screws
The 18AWG shielding wire can be
used as a communication wire with
maximum length of 820 feet
Error resolved
Replace the wired controller.
Did the error clear?
Power off
Power off
YES
YES
Replace the main control board of
indoor unit.
NO
Check whether
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