Furnace Not Working DIY Furnace Troubleshooting & Repairs

Where to Find Us. Pingbacks are Off. Replace patio paint with stain. So when the furnace starts, those metal ducts expand and pop out on the supply side and cave in on the return side.

Furnace making noise? The delayed ignition from the gas buildup is what causes the loud bang.

knocking noise in ductwork after heat turns off

Here are the instructions how to enable JavaScript in your web browser. Posting Rules. So, what is the noise? Richard Trethewey replies: Why is My Furnace making noise? If you notice the hum when the motor is slowing down, that can indicate an amperage problem in the motor.

Why Does My Furnace Make a Loud *BANG/BOOM* Noise When it Turns On?

Even tiny holes or spaces will generate a whistle if any significant air is being sucked through them. I think its loudest when standing near a cold air return right above the furnace on the main floor.

That might be due to the fan bearings being worn out. Contact us today to schedule a service visit and be sure your furnace is ready for winter. Your run and off cycle frequency can be simply related to how well your house is sealed against drafts, and insulated. Schedule Appointment Today. This is generally a job for a professional. Add insulation to attic floor or roof. You see, when your furnace turns on, the blower is both sucking in air via the return air ducts and blowing out air via the supply ducts.

If you hear banging when your furnace turns on, there are two likely issues. Bottom Line These are just a few of the potential noise issues that you may face in dealing with your furnace. First, turn off all power to the unit and turn off the gas at the gas valve that serves the furnace. Then you turn it to Pilot. With a little do-it-yourself experience and the proper guidance, you can troubleshoot and repair a variety of furnace problems yourself.

If your ductwork or furnace starts to make noises, you will want to make sure this is corrected as soon as possible. Other causes include a tripped circuit breaker or blown fuse, or—in the case of combustion furnaces—a pilot light that has gone out.

Brand Created with Sketch. Metal ducts make all sorts of noises. All appliances — including our furnaces — produce a certain amount of noise during normal operation. Having a professional clean your duct work thoroughly can reduce or eliminate the loud noises you are hearing.