combi boiler hot water only works when heating is on.

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hi! can anyone help me, i have a eurocombi styx sx20 mffice supplying me with central heating and hot water. my problem is that if the heating is off and i turn on a tap the boiler makes a noise but the boiler does not ignite and heat the water. if i have the central heating on, which all works as normal and then turn on the tap the hot water is fine, it all works. i've looked at the manual for the boiler and i'm thinking diverter valve.
 
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I expect that the capacitor in the pump is failing.

Can you remove the capacitor and measure its value?

Usually about 2.6µF and if its much less than 2µF then the pump will have insufficient torque to operate the system flow switch.

Tony
 

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