Recent content by lewisjohn

I’d appreciate any thoughts/advice anybody might have on the following. In 1991 we had a fully pumped central/hot water heating system installed. The system was wired around a Randall Mk3, scheme R69 wiring centre. The MPV was a Smith’s Switchmaster, the pump a Grundfoss-Selectric...

I’d appreciate any thoughts/advice on the following. Since replacing (professionally) the MPV on our fully pumped system recently either the 3 amp fuse in the system's electric supply plug and/or the 3 amp fuse in the wiring centre “blow” at seemingly random intervals (few hours, a day or...