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Can this fault (S.53) be caused by blocked flow? I have this code on a Vaillant boiler and the flow isolation valve seems to show signs of leakage. Could this valve have failed shut?

Well, I fitted a pressure gauge and found that the mains pressure did not go above 2 bar - so we did not proceed with changing the PRV. We did change the routing so that the cold was teed off before the Megaflo PRV and this maybe helped overall flow rates.

Thanks for the advice everyone. The cartridge came out and the strainer did not disintegrate. There was a fair bit of crud in the strainer but probably not enough to affect the overall flow. Daniel

I will try to get a pressure gauge fitted. What I can state already is that I have two identical showers on two floors, one on the same floor as the Megaflo and one 3m above. The are both fed by 22mm pipes to identical valves and identical large 8 inch heads. Without the heads they pass...

And water does not come pouring out / my house does not blow up??

I may be being thick, but I can't see how to remove the cartridge with a spanner. There are four allen keys on top of the valve and no sign of a nut below. I removed the allen bolts but the cartridge did not come off easily and I did not dare to pull hard.

No I haven't.

I have been very tempted to increase the pressure feeding my Megaflo too. I know there are all these dire warnings, and I am not ignoring them. However, removing the pressure reducing valve would seem like madness to me. The device is tested up to 10 bar and the pressure relief valve is set...

simond, you are a genius :!:. Funny how you don't change your thinking when a new technology like wireless comes along.

What if you have two heating zones, or three? It seems odd that the zone with a CM927 cannot be turned off by the programmer. My heating program is on 24 hours a day because all zones are programmable (but not wireless), but if I go away the programmer can turn off all the heating at once. I...