Hi, My RC Plus thermostat appears to have packed up. it's not the boiler, shorted out the link for the thermostat, all ok. Now, it appears the RF signal isn't either being transmitted or it's not being received, accrding to the instruction leafletl Any Idea how I can work out which unit is faulty. The "sender " appears to be operating as usual, the receiver sets up as per instruction apart from responding to the signal from the sender unit. How can I work out which bit is U/S ? Jeff