Mitsubishi vrf 7107 alarm

[GAJ87]

I have a Mitsubishi vrf system with a sub bc box . I keep getting alarm 7107 bc 52 ive checked addresses and ive checked wiring and all seems ok . Anybody ever had this or any ideas as to what it might be .

[Anz]

port error

[Brian_UK]

Is this a new system or a new alarm on an old system?

Switch settings correct, SW2 and SW14?

Has anybody else been touching it?