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Anyone got any ideas why the boiler now has a slightly louder hum during operation than it used to?

OK, I've stripped down the aqua sensor and all seems good in there, impeller rotates very freely and no muck to speak of, the only problem was that a wire came away from the hall effect sensor connector, which I've attempted to solder back on :? Also stripped down the diverter valve and...

Well the black hose was indeed totally blocked, all bar about a 2mm bore hole, no blockages in the copper pipes either side though. Unfortunately I'm still not getting hot water :( and I've just noticed that there should be a little tap symbol come on on the LCD when DHW is demanded and it...

Thanks Gasescape, my logic cannot work out why the blocked hose (if it is blocked) would only effect the domestic hot water and not the central heating too, any ideas?

Indeed, I was kinda hoping he'd say how it was resolved.

Possibly, though this is a DIY forum, so hoping to exhaust DIY options before resorting to an engineer.

Just checking if the diagnostic reading for the diverter valve position D35 would still read 0,1 or 2 if it wasn't physically switching? Mine reads 0 but switches to 1 when hot water demand is there (I've not seen it read 2 yet). Still mostly only luke warm water for me, though it has...

Any joy Slarty?

Whether you believe you can or you can't you're right.