Hello David,
I have the same problem with my washing machine.
I followed all the instructions suggessted and tested the D7 and getting readings one way only.
I tested all others and getting readings as well but the D6 giving readings both ways but the other way only for a short period.
any help will be much appreciated.
pic of the boardand readingsof D7.
https://photos.app.goo.gl/Un57mBdBErA1CDY2A