Hi fellas ,, need a bit of help .. I'm going to a job tomorow , a daikin rqyq140py1 was going out on E3 .. The engineer checked hp sp2 all ok , switch not open circuit , checked hp s1ph transducer and Dc voltage ok and corresponds to Lp .. He has replaced main pcb .. But upon starting unit up it goes back into E3 again .. ??? Any knowledge would be grateful before I get to site .. Cheers