Have a 150 ton trane rtaa chiller with 2 circuits. Getting air code 1A9 on circuit 1 which says there a problem with exv valve replaced wire harness and checked all connection on board still getting error code. Took wire harness from circuit 2 and plugged it into circuit 1 at exv valve and get no error code when doing the exv test. however hooked circuit 1 from board to circuit 2 valve and get error again. both vales are working because I can here them operating but which ever valve is plugged into circuit 1 plug on board error code occurs, can plug either valve to circuit 2 plug and no errors occur Is it possible the 1U3 board is bad or any other suggestions. Thanks.
