The burner is a Riello 40 G5Q type 443T55, about 15 years old. It suddenly stopped lighting. There is oil entering the fuel pump but when the pump turns no oil exits. After bleeding the pump, still no oil exits. So I removed the pump, checked the flexible coupling which is fine, so am certain that the pump is rotating. With the cover plate removed and manually turning the pump, the residual oil seems to move around. Next I turned my attention to the solenoid valve. The coil has resistance, seems about 100 ohms. I removed the solenoid itself and it was not seized. The next step would probably be to patch in a couiple of wires from the control box to the solenoid and see if the control box is trying to actuate the solenoid. If so I would then be a bit perplexed. Does anybody have experience of the control box itself failing? Do these solenoid valves stick? I could see no obvious debris when I took it apart. The only other clue is that the motor will not stop running. It should timeout after 12 secs and then lockout should occur. But it runs and runs and runs. Any help would be so much appreciated,
Thanks, Peter
Thanks, Peter