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pilot stays on but still sparking?

the pilot light is on but the main burner does not light and i can see the spark ignighter still sparking
dave, November 2009
what is the make and model of your boiler, it may be a slightly blocked pilot injector,

Charlieboy, November 2009
Check the flame sensor first. This much cheaper than the pcb and more likely

mark - regd gas engineer, November 2009
PCB is not recognising flame. Replace PCB

Peter, November 2009