Recent content by Raymundo

Thanks for the replies, Gents. I still find it hard to see the point of stainless-steel and plastic parts if you're in a hard-water area. This pump is gunged up solid - the rotor couldn't be dug out of the casing without getting broken. This made me wonder if cheap shower-pumps are all-plastic...

Hi all, A friend has a Grundfos UP20-15N pump to circulate the hot water and save wasting water while waiting for the hot stuff to arrive. Well, the pump failed and, when we opened it, we found the plastic impeller seized solid in the stainless housing. It's gunged up solid and impossible to...

Well, I fired things up again, waited until the temp was just under 50C, then sat with the mains-tester glowing on the pump live terminal and a hand on the pump. After a few minutes, the tester went off and back on instantly and I felt just the lightest jolt from the pump. It continued running...

Thanks for all the quick suggestions, folks. Much appreciated. Perhaps I should describe the process step-by-step, to give a clearer picture. Cyl-stat calls for heat, boiler fires up and pump runs immediately. Boiler output temp rises steadily for about 10 minutes with no noises and all...

Hi all. Wonder if anyone can suss this one? I have an old Thorn Apollo boiler, in a system with 2 heating-zones, with Honeywell 2-ways and roomstats and a hotwater zone with Honeywell 2-way and cylinder-stat. No programmer or clocks. Only using HW now, of course. Replaced the overrun stat a...

Thanks for the reassurance Namsag. I noticed on the first new o/run stat, which was replaced when I got no o/run, a white label with a dent in the middle. I dug through the paper and found a little brass screw-head. Looks like an adjuster to me, so maybe it is possible to change the setting. It...

Thanks for all the replies gents. My concern was that there's supposed to be some overrun, at least on "high", but I'm getting none. Still, there's no noise from the boiler when the pump stops, so maybe I should just accept that the newer type 'stat is less sensitive. I also had the high, low...

Hello all, I'm having trouble with the pump-overrun system on my old balanced-flue Apollo. The run-on time was getting longer, eventually reaching 25 minutes. I had an Interpart replacement fitted, No 402S088, although the number in the original instructions (1981) was 402S087 - the supplier...