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Potterton Performa 24 combi boiler ?

there is heating but no hot water what cause that please?
KAZ, October 2009
The diaphram pressure switch may not be activating the ingnition sequence when you turn on the hot water tap. Check it is clicking on and off, or in and out when you turn on the tap fully then off.

Jake, October 2009
link Click here to see other fixes for Potterton.