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thanks for reply open - yes - header tank in loft why would noise be intermittent?? i.e. run silently much of the time - noisy 1st thing in the morning?

have same problem. with one difference... some times pump runs smooth / silent ( I can feel it - CH on ) - but regular - 1st. thing in the morning it is noisy - sounds like air in system?? Can I fix by: closing exit valve. turning on pump - removing bled screw " venting" ( loads...

OK. I think I get it - Neon driver no good... My question is:- Does the indication from the neon driver ( weak flashing on contact with metal cooker and central heating pipes) warrant further investigation? i.e. it seems to indicate a "earth leakage" which is normal up to a point...

ok... Not liking my tool ( another George Michael quote... ;-)) But not helpful! Voltage!!?? Showing my ignorance here - I just waNt to know am I going to kill myself - not bothered what voltage I die at...! I have a meter ( two pole?!) - amp, ohms, volts etc. what current (...

Just installed replacement element in fan oven. Decided to deploy never used before "electricians" screwdriver ( A draper cat.II neon bulb type) to my alarm it flashed weakly when i TOUCHED BARE METAL parts of cooker... to my further alarm it flashed ( again "weakly") when I touched bare...