The simple answer is how long is a piece of string....but the Riello is notorious for solenoid coil failure...this is the device that switches the oil on after your burner has been running for 10 sec. There are numerous other possibilities though - I'd call an OFTEC man in rather than faff about with it.
Presumably you've pressed the lockout lamp button to give it another chance?
John
November 2009
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