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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> can anyone help please ? https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1161876459 Message started by markw on Oct 26^th, 2006, 4:27pm

Title: can anyone help please ?
Post by markw on Oct 26^th, 2006, 4:27pm

have an indirect hw/ch system (with potterton suprima boiler) that intermittantly trips the main rcd when using the programmer to turn the heating on at the set times. The only way i can consistantly turn on the hw or ch without it tripping is when i manually start up the hot water by turning on the power with the cylinder stat on its lowest setting and then turning the stat temp setting up. This is the way to tuern the CH on as well. I presume this rules out any wiring problem and i have already replaced the programmer. One CH engineer and multimeter has already given up on this one. Appreciate any help

Title: Re: can anyone help please ?
Post by scotspark on Oct 26^th, 2006, 5:01pm

only thing i have come across before has been a motorised valve letting water into its eletrics.

doesn't sound the case here tho.

Title: Re: can anyone help please ?
Post by chtechie on Oct 26^th, 2006, 6:17pm

Had a couple of installations where the valve is directly below the pump and those isolator valves with a slot have been used - these valves leak and make the valve wet - RCD trips.