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Comments:
I, along with so many others, owe you a big thanks for posting the details of this fix. I have just changed the DV diaphragm on my WB CD26i.
The job went well. I too had the problem whereby no water came out when I opened the drain valves; I hadn't bled my rads for ages so I relieved some of the pressure in the system by opening the rad valves and letting some air out. Then I pushed a small screwdriver up the drain valve opening to clear the blockage and the system drained. I'd say the job went very smoothly and I didn't really find any of it too tricky. One thing that no-one had said, and was also totally absent from the manual was that you have to disconnect the pump from the DV - a small point but it had me confused for a while. I took the whole of the DV out to change the diaphragm - found it quite easy that way. Used all new washers/o-rings. Cleaned surfaces and silicon grease all over! No leaks! New diaphragm cost me £7.50 and o-ring pack cost £14. The old diaphragm was totally shot, in exactly the same way as yours. I now have hot water. Thanks again.


Added: December 30, 2011
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Comments:
Was unsure of where the PVC valve was located, found this website from trying to google that. SO glad i found this, its going to be so much help in the future!!

Added: December 14, 2011
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Comments:
Excellent! I took care of this problem last night! Easy! Thanks!

Added: December 10, 2011
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Comments:
As someone who has recently been quoted £280 to do this job by worcester i followed your instructions did it myself right 1st time no problem took me 1 hour cost £10 thank you so much owe you a drink.great site.

Added: October 16, 2011
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Comments:
Thank you i have done my boiler,I had the same problem good as new now

Added: October 6, 2011
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Comments:
I have to say im annoyed by people like you who think a job such as replacing a diaphragm on a CDI combi is easy. Ive had many years experience as a boiler engineer and I still find this to be a difficult job to do due to the many "what ifs". Can I just remind yo that you must be gas safe registered to do such work on a boiler like this ....

Admin reply:
Hi Dan,

Thanks for your feedback. It is disappointing to hear that my overview of what's involved caused such annoyance; it certainly wasn't the intention. You are correct in saying that diaphragm replacement isn't an 'easy' task per se, however neither is it beyond the wit of someone with a certain level of mechanical aptitude. (Some would argue that if I can do it then anyone can! ) I think you might be surprised that this level of ability is not all that rare given the number of e-mails I receive from others who have succesfully tackled this job; many (perhaps most?) of which have hitherto not even looked inside a boiler before. What they do all seem to have in common however is a desire for a job well done, a certain level of mechanical aptitude and related transferable skills/experience, and perhaps most importantly an approach with due diligence in taking the matter seriously given the potential consequences of getting it wrong.

With regards to your belief that one must be registered with Gas Safe in order to perform this task I would have to disagree with you there. As I know you will be only too aware, but to aid other reader's understanding, the regulations governing such activities are detailed in The Gas Safety (Installation and Use) Regulations 1998, however the nuances of that document do admittedly add up to something more than a one-liner. However, what it is clear upon is that you must be Gas Safe registered if performing 'gas work' (whatever that is) for 'reward' (i.e. payment for the sake of argument) and that if receiving no such reward one must only be 'competent'. It doesn't define 'competent', and it certainly doesn't define it as being Gas Safe registered. As far as the regulations are concerned it is therefore perfectly acceptable to perform this work, for DIY purposes (no reward), without being Gas Safe registered. I would, however, caution against anyone without training/supervision from performing any work on the gas-handling aspects of the appliance - the diverter valve not being one of them.

To clarify, I clearly state that it is not a guide, but rather an overview of what is involved and, in doing so, my aim was to give others a heads up as to what they'd be up against. It is up to them whether they consider themselves competent to attempt the repair, and indeed I regularly receive e-mails from people saying that they were going to give it a go until they read what's involved and decided against it! However, as mentioned, I get other e-mails (far more in fact) detailing success stories so you really shouldn't underestimate the skills of others. Besides which, we are all still your potential customers - particularly for work involving the actual gas side of the appliance - and so I'm not quite sure what your gripe is? You might not find it easy, but others do (or, to be fair, easy enough). There's nothing wrong with either viewpoint and, more to the point, plenty of room for both.

On a lighter note, one only has to read the e-mail I received, and subsequently published on the boiler page, to gain an appreciation that there are indeed a number of "what ifs" to this task!
Cheers, Mathew


Added: August 26, 2011
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Comments:
Brilliant web site, Very informative.

Added: August 12, 2011
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Comments:
4'X3' sheets of aluminium stored in the loft for seven years!! We might be related?!?!
I found your site after googling to fix my boiler, and the cat feeder has made a long evening at work pass with a smile. I hope my wife never finds out about my visit (and future visits) here, or she'll ban the computers.
Fantastic site, and the articles are informative and enjoyable. Well done.


Added: June 22, 2011
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Comments:
there is a hyundai god......thanks your manuals have stopped the headaches.

Added: June 16, 2011
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Comments:
Very cool project, your cat feeder! I also like what you did for World IPv6 day.
I sent the link along to a couple of other IPv6 enthousiasts, but they turned out to be too immature for the power bestowed on them... sorry about that.


Added: June 8, 2011
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