You can check if it is a Slimline RF V3 by doing the following:
- Hold down the power button to turn the thermostat off
- Hold down the clock button until you see 00 01 on the screen
- Keep tapping the clock button
- If it loops round at 10 it is a Slimline RF V3
- If it loops round at 17 then it is a Slimline RF or Slimline RF V2
You will need to get the Channel number of the UH8-RF
While the unit is switched off
- Hold down H until you see P1
- Press clock to go to P2
- Press H
- Use the up and down keys to set the Channel number
- Press H
- Use the up and down keys to see the zone number
- Press H
- Use the up and down keys to set RA if it is a radiator system or UF is it is an underfloor heating system.
- Tap A
- Tap power button to turn on
Turn heating up on thermostat to test.