No hot water I am completely lost of who to call

onomatopoeia99

petra.lockton wrote: »

It does. I mean the boiler turns on, and I can hear a very similar noise. But it does not sound unusual to me ... It is same when the heating turning on

If that was a response to me, then perhaps I should make the question clearer. Normally when the boiler is heating water you might hear the flame sound of the burner, but you shouldn't hear any "boiling water" type noises (like a kettle might make when getting near to the boil, possibly some whistling as well) as the water shoud not get that hot. If you do, the problem could be the flow is so restricted that the water boils inside the heat exchanger before it can be forced through. If it does, the burner will cut out as the boiler will sense the water coming out of the primary heat exchanger is too hot and turn the flame off.



If the primary heat exchanger is clogged eventually the central heating will start causing the same problem as the hot water, and it won't run at all.


If this the case, is one thing you can try is adding a bottle of X800 (about 20 quid from screwfix so worth a punt) to the water in central heating circuit and letting that run round. They say it takes an hour, but a week is better in my experience. If that sorts it out, drain the CH completely, refill and add inhibitor to stop it happening again.


My experience as a DIYer, not a plumber.

Norman_Castle

petra.lockton wrote: »

No the issue is still persist

Yes the £1000 used up now completely.

petra.lockton wrote: »

It does. I mean the boiler turns on, and I can hear a very similar noise.

petra.lockton wrote: »

He was here 4 or 5 times but yes, it feels to me as well.

Use the quote button so we know what you are responding to.

petra.lockton

Thank you for the message. And in this case no, there is not any sound like that. I can hear that the boiler is firing up and then I can hear that is "working" but nothing like a kettle getting to a boiling point.

buglawton

No mention so far in this thread of water pressure. Combi boilers need a minimum mains pressure, latest premium models can cope with a lower pressure.

If your combi is also supplying the radiators then the closed-loop pressure needs to be carefully set between 2 limits.

Obviously if the heating technicians have been in already then the above elementary checks would be done.

https://www.diynot.com/diy/threads/vaillant-ecotec-combi-boiler-pressure-water-issue.160787/

I'd go to the Vaillant website and look up a local Vaillant approved technician.

tacpot12

I had problems with a 13 Year old Vaillant Ecotec Plus 824 earlier this year when a local engineer could not seem to get to the bottom of the problem (and had condemned the boiler as being beyond economic repair). I found that Vaillant's Engineering service was very good value. They sold me a 6 month boiler insurance policy with Direct & General and sent a Vaillant engineer who diagnosed the problem and fixed it within 48 hours.

The cost of the policy was £300. There was a cheaper option but this carried a limit to the cost of parts that would be replaced. I reckon the engineer fitted about £500 worth of parts to cure the problem. (New heat exchanger, expansion vessel, pressure sensor and various tubes).

Norman_Castle

petra.lockton wrote: »

Thank you for the message. And in this case no, there is not any sound like that. I can hear that the boiler is firing up and then I can hear that is "working" but nothing like a kettle getting to a boiling point.

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bris

Run the hot tap, the boiler will fire up. It should stay fired up when the water is running. if it cuts out then it's a problem somewhere with the boiler.


Having the diverter, flow temp switch and plate heat exchanger replaced I would say the PCB is to blame.

Alex1983

Run the hot tap and press the i button, this should bring up the status code. Leave the tap running and record the s codes. Put them up on here and it will give us a ideal of what the boiler is doing.

southcoastrgi

Murmansk wrote: »

If you go to "ultimatehandyman" forums there's a sub-forum on central heating and boilers. Lots of experts in plumbing answer questions on there, so if you post your question there you might get an answer that's very well informed

SandraX wrote: »

Dear OP

Register with Screwfix forums - very good and quick.

Goodluck

SandraX wrote: »

Btw, also try Mybuilder, but not as good as Screwfix.

There are some very knowledgeable people on here as well