Alpha 28x Hot water - but only with the CH turned on

[coopersim]

Hi!

I've had a quick look to see if this has been covered before, but only variants of this problem!

I have a 28x that provides hot water, but the central heating comes on with it, and in 15 minutes you can hear the water boiling inside the radiators. Soon after this the water pressure rises on the guage in to the red section.

Moving the temperature selector makes no difference in the temp of the water in the central heating

I'm thinking it's either the diaphragm or the diverter.

Any ideas? Thanks

 

[gas4you]

I would be checking the DV an also the Expansion vessel for pressure.

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