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I don't think so. It's a brand-new boiler set to 85, and it cuts out at 85. I'm guessing the (very) short circuit left once the last TRV shut off gave a rapid rise over residual heat in the heat exchanger. It only went up to 105 very briefly, but that's no good.

Exactly. So why not have the auto bypass (wherever it is) also cut the boiler? The pump would remain on (as per room-stat control) so as TRVs open the bypass shuts off and the boiler fires up (as per my patented inverntion :lol: )

You're right: In theory I could do, and lower the room-stat accordingly, but I tried this and when the last TRV closed the boiler would sometimes go over 105 deg. which I assume (judging by the noises) is bad. Without bypassing this just doesn't work in practice, and with bypassing it still...

Yes, there are automatic bypasses that open when everything else is shut - but then its far from perfect to have the boiler on for nothing. If the roomstat is set to a higher temp than will ever be reached this could be for hours each day... malkie, that surely applies to the kind of boiler you...

While trying to figure out the cause of my central heating woes I'm wondering if there's a useful improvement that could be made to the current type of system: Having TRV's is clearly a good idea: All radiators should have them fitted to allow individual rooms to be set to a preferred...

I inclined the run of the vent myself as it was laid flat and I wanted to get the maximum heigth at the highest point. But the feed is still pretty much perfectly horizontal (given that the roof joists are on the level). Both pipes also have a short run at 90 deg. before they go down to the pump...

Reading back over the previous page this stood out to me: Measured at 700mm - but is this enough? I don't know if it's unusual, but the F&E tank is a fair distance away from the airing cupboard: Directly above the pump are two large cold water storage tanks (put in because of our...

Here's it caught in the act: And here you can just about see the white bits lurking in the water: It looks rustier today.

The pump does have the arrow pointing up to the 3-port. The previous pump was a GRUNDFOS UPS 15-60 and was set to the maximum speed all the time. That was 2100 RPM. The new pump is a "Circulating Pumps ltd. CP63. This has lower RPM for each range, (1800 RPM max) but the corresponding power...

Glow Worm Ultimate 80FF

Peering into the F&E tank with a 1,000,000cd halogen lamp can be quite revealing. :D Of course I'm only guessing, but the water is milky white with white flakes - just like looking into a scaled-up kettle. Our water is chronic with lime here in Dorset. This is after the system was over-pumping...

Hello DP, Unfortunately it is. Well, that's how it's plumbed and it does pump over. It's always been a pumped system - the house is only 10 years old and we moved into it from new. Sure, but we seem to be running out of candidates.

Still pumps over after all rad & HW circuit bled. The top of the vent goes up 700mm above the F&E level and the feed point into the bottom of the pump is 2900mm below the F&E level. One extra bit of data - with the manual bypass fully open, it pumps over noticeably more vigorously than with...

I did a thorough check with a very powerful magnet but couldn't pick up any hint of ferrous blockage (as described elsewhere on these forums). Also, when the feed and vent pipe were swapped to their correct positions, the pipe was dismantled and renewed in that critical region where scale...

More restriction in the new boiler? Hadn't expected to hear that. But isn't pumping-over a sign of excess positive pressure? I thought my vent was located at the nuetral point between the feed and the return side of the pump. Also, the gush of water out of the vent only happens when the pump...

Return visit today, another engineer with lots to grumble about over the "jacked up F&E job". This one dropped it back down to free the vent pipe and left with Sentinel X400 (sludge disperser) in the system. Apparently, the theory behind filling with X400 is to flush out residual cleaner...

Good spot Tony. There is actually an automatic valve on the right, at the same level as the upper connection to the HW Cyl. (forgot to sketch it in). Not sure it works though. I just pulled a panel off inside a cupboard that was hiding the pipework for two rads on the ground floor. The layout...

The definition of "only" (as in "only a boiler change") would seem to be crucial here :wink: . Since the boiler change, the noises from the system are just plain silly. From my perspective the responsibility must be with the engineer and his company to leave it in a reasonable state. They...

heatingman: the new boiler is a Glow Worm Flexicom 30hx. The old one was a Glow Worm Ultimate 80FF I think the original installation is mostly mostly to blame for the scrappy appearance, although I can sort of see how the new work could have been neater. Nothing else is really visible. The...

Here's the layout around the pump. It's a 3-port valve. I couldn't get a photo of it all in so I sketched the valve and the indirect coil in HW cylinder. I didn't get to see which pipe was churning - I was enlisted to start/stop the pump while plumber was up in the loft. I could just hear...