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If I pull the metal cover off of the switch will I be able to see anything?

Recently drianed central heating and to fix a fault. Afterwards turned the heating back on at the programmer. appear to now have no signs of life within the oil fired boiler, programmer on the wall seems ok but now have a valve next to the pump in the airing cupborad clicking loudly every 3-4...

As you can see I am new to this so please forgive me if I am asking the wrong question in the wrong area. Problem:- I have recently bought a 1970's house with oil fired central heating and and struggling to get to grips with it. After finally getting it to run ok I then managed to...