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Spill switch activates once a week
My 30 years old Burnham IN6 gas steam heat boiler has been shutting down once a week for the past five weeks. Does anyone know why the spill switch would activate almost exactly once a week? I tried installing a chimney cap, changing the gas valve, changing the spill switch, changing the damper (it was locked in the open position), checking the chimney ducts, and moving the spill switch. Thanks.