[danner]

Hi Werk_AG,
Thanks for the prompt reply and the first question was the clue I needed and the answer was NO, and the answer to the second question was yes both RX and WD sketches had Relay_ID = 0xA3 but to make sure I took both Nano's out and re flashed them with a carefully inspected sketch. Still no go so I carefully tested the components on the WD board and made sure the current draw was inside the limits of the 386 on the LED circuit, all good and the rest of the board tested perfrctly as well. Then I remembered that the TX module used on the RX board and the RX module used on the WD board were not a matched pair so I swapped them out for a matched pair and it now works perfectly on the test bench, so I am very pleased with the Kit. Your help was much appreciated and I had a lot of fun working it out.
Cheers, Terry.

Could you please share what TX module and RX module you used that would not communicate?