Baxi Max Flow Boiler


We have a 2 year old Baxi boiler which has the following fault. The burner comes on and then goes out after around 10 - 30 seconds. The pressure meter is showing green. Just wondering what you people would try next.
The manual says we should replace the ignition PCB - any thoughts !?!?
Thanks Merry Chrimbo !!!!!!!
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OK upon further investigations the water coming out of the taps is at 10000000 degrees, and the reason the boiler is switching off is because the overheat thermostat is activating. Im now thinking along the lines of checking/replacing the sensors.
The manual says how to replace these, but I was thinking of switching the 2, to see if it changed the symptoms.
Any thoughts - thanks
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