I have a new boiler fitted and have bought a Danfoss wireless thermostat. I have wired as instructed and the thermostat receiver and transmitter are working perfectly, but the boiler will not communicate. The boiler is a Procombi Exclusive 30 (chosen by plumber) and a Danfoss TP5000si + RX1 Room Thermostat. Any ideas? I cannot get in contact with the plumber. I had the same Danfoss thermostat in my last house and it worked perfectly - I am totally confused.