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Boiler is an Alpha 28 CB. Only get domestic hot water when the heating is on. All other times water runs cold. The shower will run but blows hot and cold. Thanks in advance.

Had exterior expansion vessel fitted yesterday and everything worked fine untill this morning when I found boiler off due to low pressure.Topped up to 1 bar and it worked fine. When I switched boiler off, pressure went down to zero. Boiler works fine under pressure but as soon as it cools...

Took on board chrishutts advice and also checked other threads. This morning boiler had no pressure and expansion vessel was flat. Pumped up expansion vessel to 1 bar, this also brought boiler pressure back in to the green. Heating came on and there was a slight rise in pressure, which I...

Thanks for the reply.The CORGI plumber who came today said it was the heat exchanger and has gone off to order one and fit it tomorrow. I can get the heating to work if I bleed off the pressure when the heating comes on. If I keep it in the green by bleeding a rad whilst it is heating up, when...

Hi, when heating cuts in, pressure rises to 3 bar and PRV operates.Expansion vessel has been topped up to 1 bar, but problem persists. Noticed if hot water is run same time as heating the pressure does not rise? Boiler is an Alpha 28CB, 4 years old