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I'm replacing a traditional mechanical heating/hot water timeswitch with a Siemens REV24RF. The old timeswitch has traitional wiring NL1234 with NL and 34 wired. The Siemens has N L Lx L1 L2. How does the wiring map across ? I've got a suspicion I may have got the wrong model because there...

I have an economy 7 system. The boost element blew last year and was replaced. The replacement has a trip system and tripped every time it was used. I replaced it with another one from B&Q and the same thing happens. The boost element generally trips before it heats up properly and irrespective...