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Hi, I hope you can advise me on an RF thermostat question... I have just bought a Horstmann HRFS1 to replace Drayton WR1 +RF1 units. I have a WB Greenstar 28i Junior boiler. Inside the current WR1 receiver unit I have... Live from switch and Live from boiler connected together...

I have a new worcester greenstar 30si combi boiler. Recently, even though the central heating was off, the boiler started making loud noises in the early hours of the morning. The noise was like a vibrating, droning sound but very loud. The boiler has been working very quietly for three months...