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I thought I would post a closing reply because as of about an hour ago the problem is finally fixed. After spending a fair bit of time any money ruling out the pipework external to the boiler I called Worcester Bosch again. The engineer had the it fixed within 15 minutes of his arrival. It...

As stated in previous posts I'm not an expert in the working of a combi boiler. I was going to use the trick of connecting main pressure cold water to the hot supply to clear any airlocks or blockages. However, I have seen a number of posts (including on this site) that state this cnnot be...

I will be doing exactly that. Obviously need to rule out the pipework before giving tham a hard time.

Just had a look at the installation and servicing instructions. It appears the inlet filter is a U shaped device that sits inside the cold water in connection on the diverter valve. I cannot (well hope not) believe it was not checked or replaced with the diverter valve. I don't feel confident...

Cheers dave, Il'll check these things out tonight. The engineer said that he suspected something on the hot water side based on how fast the system re-fill after he drained it. Although he couldn't prove it he thought there was ample pressure to the boiler.

Thanks for the reply Dave. All cold taps are fine with good pressure. All are fed directly from mains supply. If it is a partially blocked inlet filter, is this something the Worcester Bosch should have diagnosed, or is it considered external to the boiler? There is a Liff Limefighter...

Can anyone offer me some advice.... Two weeks ago the hot water flow rate (at all taps) from my combi boiler (Worcester Bosch 24Cdi) dropped from it's usual 9L/min to less than 4L/min. Suspecting the boiler I called Worcester Bosch for one of their fixed price call outs. The enigineer...