Mitsubishi Electric CMB-WM108V-AA Service Handbook page 176

[ VIII Troubleshooting ]
7110
1. Error Code
7110
Connection information signal transmission/reception error
2. Error definition and error detection method
The given indoor unit is inoperable because it is not properly connected to the outdoor unit in the same system.
3. Error source, cause, check method and remedy
Error source
Outdoor unit (1)
(2)
(3)
(4)
(5)
HWE1708A
Cause
Power to the transmission booster is cut off.
Power resetting of the transmission booster
and outdoor unit.
Wiring failure between OC and OS
Broken wire between OC and OS.
The model selection switch (SW5-7) on the
outdoor unit is set to OFF. (Normally set to
ON)
1) Confirm that the power to the transmission
booster is not cut off by the booster being
connected to the switch on the indoor unit.
(The unit will not function properly unless the
transmission booster is turned on.)
->Reset the power to the outdoor unit.
2) Confirm that the TB3 on the OC and OS are
properly connected.
3) Check the model selection switch on the out-
door unit (Dipswitch SW5-7 on the control
board.).
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Check method and remedy
GB