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hi i am dan, i can help you with this. what is the full model number of the boiler?
this is where the flue sensor is, are you getting an f7 and f14 error code?
i would not think a bad sensor at first, there is a separate fault code for a faulty sensor. that error code is due to too high of a flue temp. what temperature is the boiler set to, what is the return water temperature?
ok about how long is the vent pipe? i would also recomend turning it down to 48 and see if that helps it
the exhaust pipe where the flue gases come out. how long is it from the boiler to outside termination did you check to make sure there are no obstructions in it?
this is the part number i found for the sensor. 39810340 if you have any more questions please let me know. if not i would appreciate it if you could rate me on my service by selecting one of the 5 stars and thank you for using just answer.
If you don't have any more questions I would appreciate it if you could rate me on my service by selecting one of the 5 stars. Thank you