Hi, I have moved to house that has an Ideal Logic combi c24 with a Danfoss RX1-S receiver and a RET2000B - RF thermostat. However, the mechanical timer on the boiler is not working so I can't program the boiler to turn on and off at different times. Therefore, I bought a TP5001RF programable thermostat to pair with the existing RX1-S receiver, but it's not pairing. Any advice regarding the timer not working and/or the thermostat not pairing? Thank you