Discuss Oil boiler not heating up in the USA area at PlumbersForums.net
Yes I have changed control box and photo cell and still continues to run as everthin is okay but there is no flame at burner ?Check for 50-53 volts AC on white and black wire for motor. If that's good pull out photocell and cover and try ignition sequence again, if it starts its reading false light and it must be eliminated. If that doesn't do it the cell could be faulty, ie thinking its seeing light, test ohms with cell covered and exposed to light to see what that says. Can confirm it's the cell by removing from control box and try ignition sequence again, if it's the cell it will start and go to lockout. If it still stays in pre purge test coil resistance, should be around 100 ohms, if that's ok test for continuity on coil leads from control box. If all that's failed then I would change box but you already said it's been changed.
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