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Bad expantion tank

May also have a bad combution head on burner.

You may have a bad fan limit switch which is sticking, call a your local heating service company.

Need to know if your unit is a hot air furnace or a water boiler?

You may have a crack or loose connection in one of your taps in the bathroom. Traps are designed to hold water that makes a seal so sewer gasses don't creap in the house. Or your vent that gose...