myson apollo 40s sporadic ignition?

hi, when boiler gets water to aquired temp.,instead of shutting down,it comes on for 3 seconds then clicks off for 4 seconds then on for 3 seconds and so on...any ideas chaps..only thing i can think of is the thermostat ???
simon blasky, August 2006


done
Hi, does it do it on both high and low temp setting or just one?
(i'm assuming it has a high/low switch)

Paul, September 2006
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