Do you have a battery powered transmitter?
Can you take it off the wall and place it under the boiler
Can you take the batteries out and leave off for 5 minutes
Can you turn the power off to the boiler for 5 minutes
After 5 minutes;
1. Reinsert batteries and ensure thermostat restarts
yes will do be back in 5
2. Turn on the boiler again
3. Within 2 minutes the 2 should resync
Let me know if it does not
looks to be ok many thank
No problem, bear in mind that you might lose comms because of a weak battery before the low battery alert come on depending on the number of walls etc between the two units.