Recent content by seppo

Managed to get Therm Heating to come and open plate heat exchanger yesterday. The inlet was blocked by small rice grain-sized particles. Plate heat exchanger needed a flushing and that was it. One hour later we had a fully working Vitodens 333. Cheap and quick!

Ouch....... I have been searching for a solution a bit longer :( As discussed, I will let the forum know when a competent engineer is found and he/she will have rectified the fault. Thanks for all the comments.

At least I can say I am more accurate than the machine, much slower though... Heating husband.........;)

BINGO: The heating man came back with an experienced colleague, they exchanged exactly that part you show in your pictures. It was stuffed with black gunk! Just like sewage sludge or oil after 100 000 kms. As it was under warranty it did not cost a thing. He could not tell me how the system...

But it is a blocked HE, correct? Now I need somebody to exchange/replace it; that was my original gripe.... When I find an engineer I will tell the forum, what the problem was.

Here´s one link: http://www.haustechnikdialog.de/forum.asp?thema=63454&headline=Viessmann%20Vitodens%20333%20abgeraucht? Very inconsiderate of the Germans that they write in German. However, if you scroll down the page you´ll see some pics. If you need translation,perhaps I can help :)

Just noticed that simond has a Viessmann background. Therefore, here more details in case it helps. I´ve set HW temperature to 46 C, boiler cut-off to 68 C, increased the circulation pump to 85% and set the heat xurve to 1.3. Everything works perfectly when HW is not drawn, all temperatures...

No, the flow is OK as the HW is pressurised. Cold water flows into HW tank and keeps it under pressure. Radiator circuit works perfectly, the trouble starts when we draw hot water. All temperatures, sensors and the controller work normally, I am prepared to be wrong on the lime scale HW, but I...

Sorry, did not mean offence.... As the fault develops every time exactly in the same way: the boiler switches off at 68 C, temperature keeps rising until the red light comes on after temperature rises above 100 C, I cannot see any other reason for the problem. Any alternative theories?

Midland Boilercare does not appear under Viessmann approved list on Viessmann UK website!

Why do you think HE is the unlikely source? The F2 fault means overheating. The problem arises when we draw hot water and 333 switches the radiator circuit off. Although the boiler cuts off at 68 C, the temperature rises above 100 degrees in the hot water heating circuit. To me, this means that...

I went for Vitodens as it provides (on paper) pressurised hot water from its 80 litre tank. It is very efficient, our house is nice and warm all the time. The problem with hard water is well documented in german forums, the plate heat exchanger is very prone to lime scale blockage. I just wish...

You are quick!!! No, Dave Hickey does not ring bells... would you recommend me to contact him? When yes, I would be grateful for his details. Charging or paying is not the issue, of course I would pay for diagnostics and repair. I paid for one, who came, looked at the boiler and said that he...

Many thanks for a very quick reply! We have gone through all the approved installers and a number of others which Viessmann UK have pointed out to us with no avail. Many promise to come and have a look, but never turn up The installer Therm Heating is not interested in servicing. The same...

We have a 2-year old Vitodens 333 Gas boiler which comes up with a fault F2. I believe its plate heat exchanger is blocked. We have enormous difficulties in finding an engineer to fix it. At best, the engineers promise to come and have a look at it, at worst they refuse point blank. Our water is...