Mitsubishi Electric PURY-RP200 Service Handbook page 197

[ IX Troubleshooting ]
1. Error Code
6601
Polarity setting error
2. Error definition and error detection method
The error detected when transmission processor cannot distinguish the polarities of the M-NET transmission line.
3. Cause, check method and remedy
(1) No voltage is applied to the M-NET transmission line
that G(B)-50A is connected to.
(2) M-NET transmission line to which G(B)-50A is con-
nected is short-circuited.
HWE10140
Cause Check method and remedy
Check if power is supplied to the M-NET transmission
line of the G(B)-50A, and correct any problem found.
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GB