Hi there Guys, i was wondering if anyone can help, have a mid 1990's MHI unit on a truck. It was working a year ago according to the owner. He went ot switch it on and now it is showing DP5 on the dispaly. It is on R404A, not sure of the model numbers as it has been painted over.

Can anyone help with the fault code list as it really hard to get anything off the MHI site

Any help would be very much appreciated

thanks