WHEN I SHUT OFF MY BURNERS AFTER THEY HAVE BEEN ON FOR A WHILE, THEY POP.I WOULD LIKE TO STOP THAT IF POSSIBLE. WE USE PROPANE.
(1) Recognition of Extinction Pop. Sometimes a small explosion of gas in the burner head occurs when the burner is shut off. Under these conditions flashback on extinction has taken place. This problem is commonly called "extinction pop." Extinction pop, as the name implies, creates a noise or a "bang." Ordinarily, it is not followed by burning in the burner head or mixing tube, since the gas supply is turned off. The pop occurs at the time the gas supply to the burner is shut off. Sometimes it may be delayed for a few seconds.
(2) Results of Extinction Pop. Ordinarily, extinction pop is not unsafe or hazardous, and will not damage the appliance. It may result in a customer complaint because of the noise created. However, the resultant concussion may blow out the pilot flame. If an automatic pilot safety device is used, it will act to shut off the gas supply to the appliance.
(3) Correction of Extinction Pop. It may be possible to eliminate extinction pop by reducing primary air supplied to the burner. Make sure this air adjustment does not cause yellow-tipping during normal burner operation. Check proper gas pressure and proper gas orifice size. If these actions fail to correct the problem, burner change may be required.