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Thanks for the tip DP. But that is exactly what I've done !!! Based on the helpful advice from other posts (see link above) as well as following the fault finding guide I changed the DHW HE. Initially this seems to have fixed it but occasionally they are reoccurring but to a lesser extent...

Oh great thanks. One question the website states it's sold in 'cans'... Is it an aerosol or a regular sealant gun cartridge? Thanks.

Is it possible to buy wood coloured silicone sealant? After fitting an Oak Engineered floor I have a couple of gaps on the corners of door frames, admittedly if it had been fitted better there wouldn't be any but i found it impossible to get a completely gap-free fit. Many Thanks.

There's a fault finding guide HERE for these. May help you. See page 27.

After fixing the problem here http://www.diynot.com/forums/viewtopic.php?t=123110 with my heat exchanger (or so I thought). The issue with intermittent hot water is back, although it's only done it twice in 2 days. Can sometimes take a while to get hot too. Any ideas? Suprisingly the old HE...

Just and update and a thank you. Changed the HE and I now have Hot Water....phew... The old calorifier type HE (white cylinder thing) is now superceded by a plate HE. If anyone else has this problem make sure you get the full replacement kit. This includes the HE plus all pipework...

No problem, thanks for all your help.

How do I remove the fittings at the back of the HE? Are they the the type with a retaining clip or is it just the top securing bracket of the HE that compresses against them? Many thanks.

One more thing - are heat exchanger not usually open plate(finned) type devices as opposed to the white covered thing I'm looking at??

Thanks Mick....Checked the serial it's AIM etc so the PN is pointing to the 87161429020. Is it possible the picture in the manual could be different than the real part? Thanks again

Got the GC number from the actual boiler mate

Got it, it's 47 311 11 Thanks

Based on my other thread here http://www.diynot.com/forums/viewtopic.php?t=122692 everythings pointing towards the water/water heat exchanger needing replacement.... I changed the thermistor just in case but no change (well, things seem to be getting worse - no hot water at all.....) I've...

Ok here's an update... Had the plumber round...He observed the symptoms I described and then talked with Worcester....they're saying it could be the motorised diverter valve and would probably be un-economical to fix.... They also say there's a small chance of it being the Thermistor so we'll...

wow...quick replies gents, thanks. Flow rate is fine, I think BG checked that a while ago when doing a quote. Would a "well blocked secondary heat exchanger" cause the flame to extinguish?

I'm getting intermittent hot water from out boiler. Seems to take a few mins to get hot although doesn't ever get very hot at the moment, then will go luke warm for a little, then hot etc.... I've also noticed the flame will go out intermitently for 10 secs or so and relight etc... CH...