How can I fix my boiler Potterton Performa 24 conbimation boiler?

quite probable the diaphragm in the flow valve has perforated. To test you need to be able to view the boiler with front case off and when you turn on hot tap a spindle should come out of a brass section to make a switch at the bottom left of the boiler. If the spindle doesnt come out and make switch then the diaphragm will need looking at.

andy
October 2007