As mentioned h/l light on my boiler is on. A pipe burst during the winter that feeds the boiler and it has tripped out as a result. Only now getting it fixed as it is only used to heat my workshop. Cant find a reset button that has been mentioned in other posts. Riello burner. When power is turned on power light and h/l light comes on. When lockout button is pressed the h/lgoes out but when released the h/l light comes on again. Burner doesnot make a sound or tries to fire during the whole process. Lockout light never comes on. Have pics in album