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Anyone know how to reset an Ideal Classic NF50 Boiler which has presumably locked itself out from an air lock. There are no obvious reset buttons. It was working fine after I drained the sytem, replaced a rad and bled the rads but then stopped two days later.

Hi, I'm replacing a two-way landing light switch with a programme timer switch but the programme switch has terminal markings: LIVE , 2 WAY & LOAD. Can you please tell me what terminals correspond to L1, L2 & Common. I've tried all combinations but when I turn on the light switch downstairs...