Hello everyone my mother in law asked me to post this question. When her gas furnace first comes on it makes a loud bang as if being hit by a hammer, sounds like metal.....any ideas? thanks
Get your gas company furnace repair guy out there ASAP.
That loud bang is called an explosion inside the furnace. If it rattles the rafters...get help now.
Made in the
thanks inspector she is getting that done today i think
My loud metallic bang was a cracked heat exchanger. Expanding when heated. Dangerous problem.