[7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ]
Error Code 
1. Error code definition
Incompatible unit combination
2. Error definition and error detection method
The check code will appear when the indoor units with different refrigerant systems are connected.
3. Error source, cause, check method and remedy
The connected indoor unit is for use with R22
or R407C. Incorrect type of indoor units are
The M-NET connection adapter is connected
to the indoor unit system in a system in which
the Slim Model (A control) of units are con-
nected to the M-NET.
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Check method and remedy
Check the connected indoor unit model.
Check whether the connecting adapter for
M-NET is not connected to the indoor unit.
(Connect the connecting adapter for M-NET
to the outdoor unit.)