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I am going to fit the Siemens into my exsisting wiring as the old programmer has died. The thing is on the Honeywell wiring centre it lists under the programmer block, terminals for HW on and off, CH on, E, N and L. Nothing for Central Heating off?? Siemens has 6 Terminals which are for CH on...

I have what seems to be a very common problem with loud noises coming from my bolier so thought would try and get some answers if anyone can help me. It is a Gas Boiler which is a Wickes one (stop tittering!) and is an open vented system. The noises are either a rushing of water through the...