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yes both of those are working fine so would this pressure valve have been a likely cause and do I have the right part number?

so would the leaking valve been an indication of a blockage and would this have been the root of my problem? is teh part number I list correct as there is a part number on the housing itself of 207908 R

what does that mean? I need to know if that is indeed the 'differential valve' because before I remove it to solve the leak I would like to know what parts I would need.... 151017 for the said valve? Would this include the diaphragm etc...

oddly heating has now come back on however there appears to quite a substantial leak coming from the 'differential valve????' does that mean that it is possibly the diaphragm that is shot? I'm guessing the above part is the 'differential valve' from what I can make out from the...

many thanks any ideas on teh second part now then lol?

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so can I have it please? lol

Original problem 2mths ago was that the ch would heat up then cut out after 10-20secs whilst HW was fine. A new diaphragm and £130 for the 'privilege' and all was sorted. The reverse has now happened 2mths later with the hot water heating up then knocking back off after 10-15secs yet the...

What you'll need to do is put the plate in place, mark up the flue, then work around that

I had to join up to post as I actually did this today. Simply cut out a 6x6" access hole, use a 7x7" or 8x8" plate to cover. Use some mastic inbetween and use 4 self tapping screws. I got the idea from this...