Ask Me Help Desk - Hot water heat - boiler runs for 15 minutes then cycles on and off every 15 seconds

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Hot water heat - boiler runs for 15 minutes then cycles on and off every 15 seconds

Sounds like it is lighting the boiler over and over again. I thought it might be a dirty flame sensor so I used some light sandpaper on the flame sensor but did not reolve the problem. It is a Slant/Fin Victory II Boiler Model VHS-120 EP. Thanks for your help.

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