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I've also had my meter out and both flow thermistors measure within the expected range.

The pump is actually an Alpha 1. It will only show power on the display, so I've been trying to make sense of this, but it's way beyond me.

Does the boiler need to be running at 100% of it set maximum output, in my case 22kw for that flow rate calculation? The WB 8000 has a modulation ratio of 10:1, so does that mean in lowest tickover it's outputting about 2.5kw? If so, using the calculation you supplied, would that then make my...

Plateaued off now at 64.5flow with 48.5 return. The boiler is rated down to 55% so 22kw max output. It sound like it's modulated right down now to maintain the 65 degree flow.

I ran it up to a steady flow temp of 64.5 where it's been sat for about an hour. All TRVS open with thr rads balanced to heat up about equally. Room temp is around 19-20. The boiler has modulated down to what sounds like minimum and the return temp is sitting around 48.8. The pump is running on...

Great, Thanks for all the help. I'll give it a go. I may leave it until after the weekend in case I make things worse. The actual temps on the flow and return are Flow @ 54.8 Return @ 38 Room temp still climbing, but was around 17.5 at the time I recorded the boiler temps.

Thanks, it shouldn't be to dificult to divert the drain point from the condensate drain.

There is the main boiler drain at the bottom which conveniently drains out the condensate pipe. There's also the air bleed valve at the top, which has a hose connector. Which would you recommended?

Thanks for the reply. The most convenient point, avoiding a full drain down, to do the back flush would be via the Magnaclean connector on the CH return. I could then drain from the boilers drain point. Would this be pushing clean water through the correct path in the HEX?

I really couldn't accurately say about the normal temperature rise when it was running before. I've got a sensor taped to the return but it got flat batteries, so I'm just waiting for batteries to arrive latter today. Is the differential fault as listed by Worcester, referring to the difference...

Hi, thanks for the reply. I assumed that as I have the same issue with heating the water cylinder, that may eliminate circulation issues in the central heating side of the system? The problem is affecting both CH and DHW. All the radiators do heat up gradually and evenly. The installer fitted a...

Hi all, I'm at a loss now and could really do with some suggestions please. My boiler was working fine previously (should have left it alone!). I recently ran X400 around the system with a Magnacleanse attached to pick up the crud. I have drained down, flushed through, cleaned the F&E tank and...