Using "switch" trips RCD

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Using "switch" trips RCD

Post  Starkicker on Sun Feb 22, 2009 5:15 am

Bit of a long saga this but here goes.

Pre-Christmas we had a problem with the boiler and ran on "switch" for a few days until there was a phut and the RCD tripped out. Had the bottle "immersion" replaced which seemed to do the job and in the meantime the boiler was also fixed.

Fast forward a couple of months and a new problem with the boiler (Glowworm HXi - good stainless steel, rubbish rubber seals as originally built). This time the fix involved the whole system being drained down.

Boiler fixed, system refilled, heat coming to radiators but no hot water. Turned to switch to see if that would make a difference and RCD tripped out again. After 24 hours hot water returned and seems to be OK. I'm guessing there was an airlock in the heat exchanger that finally cleared itself. However, any attempt to use switch trips out the RCD.

Any ideas as to what the next step should be?

Ian

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Re: Using "switch" trips RCD

Post  Mike the Boilerman on Tue Feb 24, 2009 1:31 am

Hi Ian,

Sounds to me as thought one of the new heater elements has failed. Possibly overheated by being run whilst air-locked. A bit of investigation with a multimeter would confirm this. Each element should measure 13 Ohms approx, and there should be infinite resistance measured (using the highest resistance range set on the meter) between the copper element bottle and any of the four element terminals.

OBVIOUS WARNING:

Make sure you turn the power OFF before trying this. OR employ a competent person if you don't fully understand the above paragraph :-)

Cheers, Mike

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