Samsung SRS 2028 DVW

Could anyone help with this one works okay for 24 hrs after plug in , then flashes for high temp on display ,when checked nothing seems to be working only internal lights and display ,no compressor running or any fans running , when it is switched of and back on again everything comes back on and it seems to work okay but only for another 24hrs ,have checked all multi plugs and wiring every thing seems fine , have put on test cycle and it does not show any error codes , have also changed main P.C.B at back and also display P.C.B but still keep getting this fault.