Baxi 80HE noisy DHW

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I have a Baxi 80 HE. The problems is as follows. Turn on hot water tap, all ok. When I turn it off I get a loud high pitched noise! I've discovered that when I tap or pull (very gently) on the DHW pressure diff valve the noise disappears, only to return next time.

Any help/ideas greatly appreciated!

 

[baxpoti]

Is this an 'instant'

 

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Yes. Sorry, didn't realise there were different types of 80 HE

 

[baxpoti]

Replacing the 'O' rings in the diverters cures this, or simply replace the diverter valves themselves.

 

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Thanks for that! Do you know of any links to exploded diagrams, etc please?

 

[baxpoti]

http://www.partsarena.com/baxi/

 

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Hi again. Had a look at the website. Doesn't show any O rings.

Are they in the diverter valve itself or in each of the DHW & CH pressure differential valves?

Many Thanks

 

[baxpoti]

Valves complete
248727 E68184 Valve - 3 Way Assembly x 1
248728 E68185 Pressure Differential Assembly x 1

Sorry, thought the 'O' rings were available seperately but I can't locate a part number.

 

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Brilliant. Thank you very much for all your help! I'm surprised I'm having to replace anything really. Boiler's only 18 months old! Perhaps this is quite common though?