HI We have this bendi Model BE420-6055 serial TL10065

Customer reported the following error codes 7
74, 14, 47, 17 and sometimes 39,

When we went out to it could not get the fault to occur. Did the usual check and only thing that i could really see was battery voltage a bit low showing 48 and dropping to 44 under load. Slight earth reading on battery but apart from that could not get fault to occur.

Can anyone please shed light on any of these errors or even better share a fault code list for this truck please.

It uses the Curtis AC control system.

Thanks You