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ariston error code 501?

We are getting error code 501 when switching on our Ariston Clas he boiler - can anyone tell us what this code means and if possible how it can be resolved?

jason
October 2009
AristonHeating, Home Heating SystemsError Code Boiler
Error 501 is "no flame detectect" after 2 ignition attempts. My boiler does this as well and pressing the reset is usually enough to get things working again.
It is annoying as it seems to be getting worse (occurs more often) so the heating can't be trusted to startup when required.

Bob
November 2009

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