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Does this sound like a faulty diverter valve.

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from United Kingdom

Joined: 17 May 2008
Posts: 20
Location: Manchester,
United Kingdom

PostPosted: Thu Apr 15, 2010 7:53 pm Reply with quote


I have a misbehaving boiler. It is a Worcester 240. The thing is every night when I'm just about to fall to sleep I hear what sounds like air knocking through my pipes in my bedroom radiator. It lasts anywhere between 5 and 15 seconds.

It's been doing this for a few months and there is a back story which I'll go through. First off the boiler sprung a leak six month ago. It was a perished fibre washer. I replaced it and felt all smug. It was about this time I noticed the noise.

Next I started losing system pressure. One morning I noticed the pressure was up near the 3 bar, I left a bottle under the PRV pipe and it filled up. Tried the valve on the expansion vessel and water came out so I fitted a new vessel. Left the old one in the boiler as I can't touch gas and fitted it external to the boiler. The system pressure stopped going high and my system stopped losing pressure. I felt all smug again.

Until I'm just about to fall asleep and I hear this noise. What the heck is it? It is still happening even though the central heating is off on the front of the boiler but the noise is definately in the heating pipes.

I should also say that I put the dishwasher on just before I go to bed (it's got hot and cold plumbed in) and I'm fairly sure the noise is coming when the dishwasher pulls in hot water and last night I noticed that a pipe into two radiators upstairs was warm at the time I heard the noise. Can't say if it is flow or return and it isn't on all radiators. The heating is not on.

Does it sound like a diverter valve? Anyone know what's going on?

Bit long winded. Thanks for reading and any advise.

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from United Kingdom

Joined: 10 Mar 2005
Posts: 3513
Location: Middlesbrough,
United Kingdom
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PostPosted: Fri Apr 16, 2010 2:07 am Reply with quote

Hard to tell from here . You could try turning the hot tap off to the dishwasher and let it heat it own water up electrically. That way theres no HW drawn from the boiler.
There could well be a diverter fault and it is a common one on these boilers.
When you turn a hot tap on does the flow pipe get hot?
I noticed that a pipe into two radiators upstairs was warm at the time I heard the noise.
Ok I'll take it that it does.

Whats bugging me is that its unusual to have hot and cold to a dishwasher. Does it have a connection for each one? My dishwasher is 24 yrs old and only has cold. Every other one I ever noticed only has cold!
Ive got a feeling someone unqualified has been playing with a Y piece. This could cause it to appear that you have a DV fault
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