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I'm bumping up this old thread because we're having the same trouble with our 30HX. (thread here. As it's about to get its third electrode in 2 years I'm wondering what exactly is known about the "early ones" that mickg mentions. The SN is 21083700... a little bit earlier than RigidRaider's

Thanks to those that have been helpful, I'm now thinking the odd orange flash is a breakdown somewhere at the base of the (new) electrode, because I've now watched for some time and when it ignites properly (silently) there's no orange flash at all. I've still not been able to watch it when...

What do you know. After my last post above (Jan '09 ) An engineer "fixed" the fault by replacing the ignition electrode/cable assembly which did indeed seem to be arcing in all the wrong places. Now, Nov '10, it's suddenly started doing the same flipping thing again. Well, not exactly. It...

Thanks. Just wanted some opinions before (potentially) getting fobbed-off. Sounds like we're in the hands of the experts again. :roll:

Three-month old GlowWorm Flexicom 30hx occasionally fires-up with a window-rattling, door shaking boom. Checking the diagnostics it shows Average ignition time=1.5 secs. and Maximum ignition time=4.4 secs. No Unsuccessful ignitions are logged. I've never had a boiler do this before, is...

SO, now I'm slowly catching up with the concept of SURGE. Apparently "surging" is the fancy plumbing term for the problem in my system. Looking at the recommended installation diagram, the top of the open vent loop was shown at a minimum height of 450mm above the head in the F/E tank. This...

OK ChrisR, here's how it's plumbed - as per boiler manual, except the pump is vertical and on the floor above the boiler. The system has been thoroughly checked to make sure it conforms to this layout - in particular the relationship between the vent, feed and pump... We raised the F/E...

In another post of mine we were trying to resolve a problem where air was briefly getting sucked into the primary whenever the pump started. Having verified the correct layout of pump, feed and vent many people have been scratching their heads trying to figure out why the air gets in (in...

Been running the system for a couple of weeks now and it's no better for having the combined feed and vent. Its hard to describe just how much air can be heard in the rads and pipework. Putting it as simply as possible, air has been getting sucked in whenever the pump starts, and it all...

Good tip with the foam. The thing is now Tony, they've cut the cold feed out and linked the feed into the vent just below the F+E tank. Now the suction pulls on just the one 22mm pipe. The vent is still open, looping over the top of the F+E so it's exposed to air - and it's still gulping it in.

There's obviously a balancing act involved here between the bore and length of the feed and vent pipes. Somewhere (BS 5449?) there should be some formulas. I wish I could find where I read about the vent (?) having 3% the volume of the system.

I can sympathise with that, I'm a moderator on another forum where the average thread is 30 pages long and people grumble like crazy if someone joins in on the end without reading everything first! The huge potential for sucking in air through bad joints on the inlet side is appreciated. This...

Sure, it seems to make sense: when the pump stops it becomes a restriction in the flow so inertia keeps the water going up above the head in the vent . Similarly when the pump starts, inertia of the water in the bulk of the system makes it want to stay put so the suction temporarily pulls down...

OK, now I've had another thought experiment that could help me understand things better - say my boiler downstairs fell down a deep mineshaft and the pipes magically stretched all the way down to the bottom. Now the pump can either lift water up from the bottom and circulate it back down, or it...

It's not just four engineers Tony. Once they'd started to scratch their heads (about the time I started this thread) each visitor spent as much time discussing the problem on the phone to HQ as they did indoors. This is a big firm that cover a wide area and I find it hard to believe that nobody...

I would agree that there's some poking and hoping going on. Bear in mind that I haven't lifted a spanner to any of this. To date four different heating engineers have visited and done the work I've described here. I can't agree that I've chosen to ignore advice though. I've just re-read this...

Wow! Perhaps you should cash that in with a scrap metal merchant and use a plastic tank instead. :lol:

Here tiz, This is obviously a "done thing" then - although quite what I'd use as the surge arrester vessel is a bit of a head-scratcher (unless I use another well insulated F+E tank!) I'm already beginning to notice steamy hot water in the tank tonight, so the combined vent and feed is...

The visiting engineer today agreed with you Agile and combined the feed with the vent... The old 15mm feed was cut and capped just before it went into the bottom of the tank, and the 22mm vent (and newly combined feed) is now T'd off in 15mm to the bottom of the tank. Now when the pump...

Won't the surge still push hot water up into the tank/draw water back down and aerate it in the process? Preventing the surge with a "Surge arrestor" sounds less like a palliative and more like a cure to me. Edit: I can find plenty of electrical surge arrestors but haven't found anything...