Hi,

We have just purchased a used semi trailer with Thermo King SL 250 refrigeration unit.

It works just fine on the engine, but when we select the 3 phase land line it gives error code 10. This is listed as Discharge Pressure High, but as it works ok on engine I'm thinking it may have another meaning. I have tried the reset button a number of times and checked for correct voltage in from the landline.

Any ideas!!

Thanks