While you wait for answers, we may have found some information which could help you.
Click here for Red Button StartsRiello 40 Burner problem?
can you fix the pump on a riello40?
My riello burner lights for about 12sec and then locks out?
My Riello 40 loses it prime ?
How to increase air supply to Riello RDB Burner?
riello 40 starts, runs fine then stops. ?