Pump coupler caught on fire

ddyckmam3

The pump coupler on my Beckett AFG burner caught on fire today . Any ideas what might have caused this ? It melted the CAD eye as well . 

BDR529

Exhaust fan in the room? Power vent? Direct vent?

Seen them melt when pulling air down the chimney

Jamie Hall

Pump free to rotate?

STEVEusaPA

Back pressure. Plugged heat exchanger, blocked chimney, and/or negative room pressure pulling products of combustion backwards thru the burner.
Also incorrect burner set up, and on furnaces, cracked heat exchanger, clogged filter with an open return.
Figure it out before you fire it back up.

SuperTech

STEVEusaPA said:

Back pressure. Plugged heat exchanger, blocked chimney, and/or negative room pressure pulling products of combustion backwards thru the burner. Also incorrect burner set up, and on furnaces, cracked heat exchanger, clogged filter with an open return. Figure it out before you fire it back up.

All of the above are the usual possibilities.  The only time I ever saw this happen the heat exchanger was plugged with soot and the homeowners kept resetting the burner.  

You have major problems. The burner is not safe to operate until the cause is identified and corrected. Call a pro who is familiar with oil heating systems.

Steamhead

SuperTech said:

You have major problems. The burner is not safe to operate until the cause is identified and corrected. Call a pro who is familiar with oil heating systems.

This.

@ddyckmam3 , where are you located?

426hemi

It is a furnace if so did the air handler door fall off or did you change the filter? If it runs without the door it will pull negative pressure and suck the flame out the burner.  Also everything else everyone has said.