Mitsubishi Electric AE-200A Service Handbook page 62

[V Troubleshooting]
Error Description and method
code of detection
System abnormality -
Different unit model error
ALPHA2 program
version mismatch error
7130
Version error
7905
NOTE:
When the error code is for a detection source other than AE-200/AE-50/EW-50, refer to the service handbook
or each air-conditioning unit and perform the checks and take the corresponding measures.
Cause
1) The ALPHA2 program was created and
run without using the base program
supplied with AHC ADAPTER.
2) Version data has been overwritten in
the base program supplied with AHC
ADAPTER.
3) The ALPHA2 base program used did
not correspond to the AHC ADAPTER
version.
PAC-YG50ECA is connected.
58
Check procedure and remedy
Causes 1) and 2)
Confirm that the ALPHA2 internal program uses
the base program supplied with AHC ADAPTER.
Check that the program version number matches
the base program version number.
=> If not, recreate the ALPHA2 program from
scratch using the base program supplied with
AHC ADAPTER.
Cause 3) (N/A as of April 2013)
Disconnect PAC-YG50ECA from the system.
If an expansion controller is required, use the
AE-50/EW-50.