Alpha 240P Hot Water Problems

[nigdra]

I am having problems with our Alpha 240P combi boiler, the central heating is working fine however the hot water works only when the boiler has been on and is warmed up from the central heating.

If you turn the heating on and then open a hot water tap the boiler will go out. I have had a look at the valve positions, when the hot tap is opened the front valve actuates a pin and closes the contact on the solenoid. The back valve seems to stay open with the solenoid contact closed.

Once the heating has been on for 5-10 minutes the hot water works normally.

 

[gas4you]

Forget about the pin for a momemnt, does the hot water demand light come on, on the front of the boiler when a hot tap is run?

 

[nigdra]

Yes the green hot water light comes on when a tap is opened.

 

[gas4you]

It sounds like some form of blockage to me. Unfortunately I am no expert on alphas. You need Paul Barker to come on he seems to be the Alpha man

 

[nigdra]

OK thanks Dave

 

[Paul Barker]

If dhw diaphragm activates the boiler but tap water only gets warm when heating has alread heated adiotors diverter valve is likely leaching. Needs primary side service kit £30 plus VAT. Probably also needs cleansing of system water.

To test for leaching shut CH flow iso valve run hot tap does it now get hot? yes = leaching.

 

[gas4you]

If dhw diaphragm activates the boiler but tap water only gets warm when heating has alread heated adiotors diverter valve is likely leaching. Needs primary side service kit £30 plus VAT. Probably also needs cleansing of system water.

To test for leaching shut CH flow iso valve run hot tap does it now get hot? yes = leaching.

Didn't realise he needs his blood flushing

Why didn't I read this properly and think of the DV. I've changed enough of them

 

[nigdra]

Yes I have closed the CH flow Iso valve and now the boiler fires up directly the hot water is run.

 

[gas4you]

If ch flow pipe gets hot when only operating for hw then this is the problem

 

[nigdra]

Now you mention it I had noticed that the radiators have been warming up whilst using shower or bath.

Thanks for your help Dave & Paul.

 

[Clarkeyslad]

Hello there, I am having the very same problems with my boiler, i have already changed the diaphragm in the DHW Flow Valve and was wouldering if anyone can tell me where i could get the service repair kit for the primary side of the diverter valve.?????