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I have a Vaillant ecoTech central heating boiler which has stopped working & is showing fault code F.76 Anyone know what this means please? Thanks

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  • Heating & Co... Master
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F76 over heat protection triggerd on heat ecxchanger , check water leval of just google vaillant fault codes

Posted on Jun 03, 2010

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It would seem a joint has come a bit loose from the heating and cooling cycle. put a drip pan under the leaking area( the drips would evaporate quickly), then next time you shut it down go through all the joints in the area with wrenches to find the loose joint.

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My Vaillant Boiler (sorry don't have a model number, although about 16 years old) is giving me central heating but no hot water...BG came round and just said i would need a new boiler (£2000+)...


Vaillant UK have therir own service techs (I used to be one). They sound pricey but they carry plenty of spares and usually fix it properly first time. These units are complicated and many gas guys shy away from working on them; either try and sell you new or hand out massive bills to replace parts that don't need replacing. At a guess i reckon the water section is either blocked in the venturi or the diaphragm is punctured, both easy fixes. Vaillant used to be about 120 pounds for an hour inc. callout, as I said sounds expensive but it gets fixed, maybe ask for a service at the same time so you get your moneies worth.

The only cost for this advice is if you do get them out let them know big Steve from Plymouth is enjoying Australia (left Vaillant after 10 years service in 1999 to emigrate to Oz)

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diverter valve fault most likely. when you call for central heating do you get 3 swiggley lines coming off radiator symbol in the boiler display if you do and not getting central heating then definitely diverter fault

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Code f28 what isit?


According to the user's guide, the fault code means that the boiler failed to start after 5 attempts. Here is the manual where I got the information. I would confirm the codes with your particular model. I am presuming that the codes would be standard for all their models. Source(s): http://www.vaillant.co.uk/stepone2/data/…

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I need to power flash a vaillant boiler. can you please help. water goes hold and cold, sometime the heating stop but the water works and vice versa. i was told by an engineering that it needs power...


Hi

Although not a PC problem, i have had this same issue on my Vaillant Boiler, the problem you are describing is not a power flush problem, you need to clean out your exisiting diverter valve or purchase a new one

The diverter valve is repsonsible for either providing hot water or providing hot water to the central heating, when this valve gets stuck in between the symptoms you have described above occur

I would also not recommned that you do a power flush yourslef as you may end up damaging the boiler and its pump


If this has been useful please leave postive feedback/vote/testimonial - Thank You Again - shauqatm@yahoo.co.uk

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Being the girl that you are, I'll step forward and ask your need. Can you take a phone cam pic and send it to me so I can see what the rtimer looks like. co7196@yahoo.com

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Hi,

You have a faulty diverter valve, this is a fiddly job, you need to call in a 'Gas Safe' engineer to diagnose and replace this

I hope this helps

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Most likey problem is the diverter valve, not energising fully. This in turn will not move the little plastic lever arm that actuates the microswitch on the side, sending the signal to ignite.

You can buy a diaghram kit from most local plumb centres, you need to replace the diaghram and seals, don't forget the silicon grease to ensure the plunger doesnt stick. Kits less than a tenner.

You should have noticed before it stopped working completely the water had reduced in temperature before the weeks it failed.

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