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problems with potterton performa 28?

When I turn Heating on the boiler ignites and works for about 10 sec. then for no apparent reason stops. After another 10 sec. it reignites and so on.

Can anyone help?

I have no idea.
grapevine, January 2010
you have a dirty flame detection electrode , boiler runs sequence fires up flame not detected and boiler locks out ,,,
when was last service ,....

chris, January 2010
link Click here to see other fixes for Potterton.