Gas Furnace: machine gun noise.

Dean_17

Hi,

My gas furnace caught on fire this morning. It is because the vents were not cleaned and the combustion went sideways causing a small fire. No damages. I turned the gas off and the electricity going to the furnace. When I turn the electricity back on, a loud noise, like a machine gun, goes off. What is this noise?


Thanks!

Brad White_9

If no combustion and only electricity

I suspect something fell into the fan scroll. The rapid regular cycling leads me to think this. Sort of like a .50 Cal M2, right?

Big Ed

cooked

Could have over cooked the draft inducer as well... just follow the noise to the problem... Also sounds like a bad proven switch .The burner should not have fired with a plugged vent....Call a pro

Ted_13

Furnace machine gun noise

Does the unit have spark ignition? If so that's what it sounds like when it's trying to light

John T_3

Relay

Could also be a control relay chattering. Regardless I hope you get someone qualified to come out and look things over for you. Sound like a dangerous situation.

Dean_17

The noise seems to come from the front of the furnace. Looks like where the gas valve is.

CHARLES_4

Furnace noise

Turn off the light, go back upstairs and call the Marines. Machine guns can hurt you...

Flip

noise in furnace

is it possible your low voltage wiring may have melted together causing a shorted circuit?

Dean_17

noise furnace

Flip:

You are absolutely correct.