MY BOILER WORKS FINE WHEN ITS BEEN OFF ALL NIGHT, FOR ABOUT AN HOUR THEN GOES TO LOCKOUT. PRESS THE BUTTON WORKS FOR A SHORT WHILE THEN LOCKOUT AGAIN.DOES THIS ALLTHE TIME KEEPS GOING TO LOCKOUT.SAME WITH DHW OR CH.CHANGED THERMISTOR NO LUCK STILL SAME PROBLEM.IS IT IGNITION PCB?
