Mitsubishi Electric HP120TNU-A Service Handbook page 239

[7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ]
7-9-11 Error Code [7130]
1. Error code definition
Incompatible unit combination
2. Error definition and error detection method
The check code will appear when the indoor units and BC controller with different refrigerant systems are connected.
3. Error source, cause, check method and remedy
Error source
Outdoor unit The connected indoor unit is for use with R22.
Incorrect type of indoor units are connected.
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.
BC controller Due to a function setting failure in the BC con-
troller, the BC controller is recognized as in-
tended for use with R22 or R407C only.
(1) Wiring fault
(2) Loose connectors, short-circuit, contact failure
76
- chapter 7
Cause 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.)
Check the connector TYP1 on the control
board of the BC controller.
HWE18220_GB