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Hi if your water is heating then it cannot be a burner lockout. It must be an overheat lockout. Turn the temperature right down low on the heating dial to see if that helpsI would think it is most likely a limit thermostat that is faulty.
Your correct if you have a burner lock out due to oil or other burner issues the lockout button is on the burner itself.
If the pump was faulty it still should not go into overheat lockout, especially as you turned the temperature down on the boiler.
When you say you have checked the stat front and back did you make sure it is correctly seated in the phial pocket on the boiler.
The best way to test them is to measure the temperature of the boiler when the stat cuts out.as suggested in my previous post. if the pocket has reached near 90c and the dial is on low then the stat has failed
no not really a funny question. You use a probe thermostat. if you have a meat thermostat available that will go down to about 70c that will do the jobfire the boiler with dial on low when it cuts out switch it off pull the phial out of its pocket and put the thermometer in itsee what temp its got