The Red LED flashing indicates pairing is lost between the thermostat and boiler receiver. To re-pair follow these steps:
- Ensure the receiver switch is set to Auto (the hollow circle)
- Then turn the boiler off at the mains power switch for 10 seconds
- When it comes back on wait 10 seconds, and then press and hold the sync button on the receiver until the red light starts flashing
- Then on the thermostat press OK to go into the menu, slide the wheel around until you get to 'Pair' - - Press Ok until you see '10 Sending'
- The red light on the receiver should go out after a few seconds - The devices should now be paired