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I've tried to photograph the inside of my F&E Tank, taken after Power-Flushing carried out by my installation company (sorry the photo is a bit small, but it's my first attempt and I don't know how to upload a larger version in here):-...

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Well my system seems to have settled down now so I plan to check the pump again in a couple of months. Meanwhile I am trying to find out what, if any, chemicals have been left in my system following the power-flush. I believe the installer uses Sentinel X400 and Sentinel X800 when...

Thanks Tibbot. I've had a good browse around the Internet and can't find any advice on cleaning these heat exchangers, or even on checking them for partial blockages. I have seen references to de-scaling (and we are in a hard-water area) but presumably some kit such as a power-flush unit...

Indeed Tibbot, thanks. That is why I am so concerned that my installation company don't seem to have addressed it, in merely power-flushing the boiler. Is there a recommended cleaning procedure for these boilers? Would a genuine de-scaling procedure also clear any rust deposits? I...

Thanks mickyg. The HW Cylinder currently reheats in around 4-minutes, and I often use that feature to top-up the bath (since one fill leaves it too shallow for a luxury soak :) I follow your logic re tweaking down the rating of the boiler, but, it seems me that no matter how low I tweak...

Thanks mickyg Yes, that is how the boiler seems to operate. Once the return water increases in temperature the boiler appears to modulate fairly happily at a low level. The hot water cylinder details: RCM Group Superheat High Performance Multi-coiled, copper, insulated, of approx...

Thanks Tony. Does "Pumping Over" mean primary water being forced back into the feed tank, for some reason, and causing an overflow? I'm not aware of any overflow having occurred, nor of any leaks, nor of the system taking on water from the feed tank. I have wondered about the...

Thanks mickyg Well, yes, rust-colour rather than black sludge. Hmm, that's disturbing. The installation company did the full conversion in December 2005, throwing out the old Baxi Bermuda Boiler and installing the new 24hxi based system complete with new HW storage cylinder and pump and a...

Following mickyg's recommendation, I opened-up the WILO pump and found the impeller quite heavily coated with red rust. In taking it out to clean it, I found that almost all the impeller internal pathways were filled with this rust - it is amazing it produced any flow at all when running...

Thanks mickyg. "If the pump "appears to be running correctly then I would remove the pump head and inspect the impellor, Wilo pumps have a habit of blocking up on the impellor. " I'll take another look at it then. Is the theory behind the banging and cycling I'm experiencing due to...

Thanks mickyg. The pump is running on max, setting 3, and has always appeared adequate for the system since it was installed in Dec 2005. Is there any easy way of testing the pump and hx?

Thanks Picasso. Pump is a WILO Gold RS50 running at setting 3. It was new with the boiler installation Dec 2005. It still looks good, sounds good, and seems to have no problem circulating throughout the system. The two guys visiting from the installation company both thought it was fine.

Hello everyone. This looks to be a great forum. I'm desperate for help and hopeful of finding it here. My CH and DHW system was originally served by a Baxi Bermuda, replaced in December 2005 by Glow-worm 24hxi Boiler. Open Vented 2-valve System, with indirect HW Cylinder, 11-rads (10...

Great thread Jamie, but was was the solution to the original problem? I'm very interested since my 24hxi boiler is behaving in exactly the same way. If Jamie doesn't get back, anyone else know of the solution please?