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picked a good day for it, easter sunday 😀
central heating works, just no hot water, its an ideal vogue C32. tried the usual suspect, topping up the pressure but that hasnt made any difference. looked in the manual at a flow chart and there doesnt seem to be anything thats within my skillset, so we're resigned to not having any HW for a few days now until we can get a plumber on a normal day rate. but..... its always worth a try on here isnt it 🙂
front of boiler when it calls for central heating.
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when we run the hot tap it just stays the same and says no demand still.
underneath of the boiler......
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my notes say to increase pressure open blue, then black til up to pressure, then reverse for closing. i hadnt noticed 2 blues and blacks until this photo but i assume just the two nearest ones are correct.
this is the flow chart, looking at the different options none of them seem to suggest just turning a valve or anything, so thats why i think this is beyond me.
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couple of youtube vids suggest diverter valves or turbines but i guess theyre for the experts to diagnose and fix/replace.
anything i can try that isnt going to kill us all?
thanks
EDIT: ive also tried the reset too.
I'd go with DHW flow switch, which is likely the turbine bit in the troubleshooting chart (although the decision boxes are the wrong way round for that bit...)
Not a DIY job I'm afraid.
EDIT - on the off chance that the turbine is stuck, you could try repeatedly turning the bath hot tap on and off to see if you can "shock" it free again. Unlikely to work but you never know.
Fire up the ch on full speed ahead
Then as the ox man says on off on off with the bath tap
See if you can get it to divert from ch to dhw whilst its up and running
It might then do it when ch is off
Could be pressure drop switch borked or water flow sensors, iirc some use hall effect to detect flow
just an update to this, the HW did actually come on for a while, enough for mrs ex-p to have a shower. i tried and it cut off on me midway, so had to have a cold rinse off which wasnt pleasant. its off again now.
does that confirm or rule out anything to you?
i'll try the above method when we need it again.
thanks
EDIT: just tried it and the HW did indeed kick in. thank you very much. its something to try until we can get a plumber in.
or water flow sensors, iirc some use hall effect to detect flow
Yep, I have one which relies on a plastic float being pushed upwards by the flow and on the float is a small magnet which it then detects having moved to confim flow.
does that confirm or rule out anything to you?
Not really, but the pressure flow sensor if probably the most likely candidate...
Sounds very much like flow switch to me too, IAMNAP.
But the parts usually twenty or thirty quid, I’ve fitted a replacement myself before (I’m not recommending this if your not experienced/tooled up for a bit of plumbing. I would be tempted though, in your situation, to order the part so you’ve got it in hand when the plumber turns up.
My money is on the diverter valve. Ive done ours a few times and my parents once (different boilers). Next time it fails - check if voltage is present at pins 1&3 as per your troubleshooting guide. If you're unable to check voltage buy a diverter valve anyway - it will fall at some point
If diverter valve is faulty the boiler would still sense demand, but then probably log a fault code due to no outlet temperature increase.