I had explosions like that. The ignitor wasn't firing the gas every time. Sometimes it would fire after a few tries when there was gas in the flue, and it would ignite with a pop. Adjusting the ignitor electrodes fixed it.
If cleaning it doesn't cure the problem, try adjusting the ignitor electrodes until you get a strong spark every time. (With the gas tank valve off, of course.)
X2
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Crusader 337QBH
2019 F350 6.7L DRW CC LB 4x4 Lariat
B&W Companion 20K for OEM pucks.
Good photos and description of your troubleshooting steps. Your posts need to be archived by the forum moderators for easy access. This problem pops up often.
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RamblerGuy
2011 Sunseeker 3100
2016 Ford Edge Toad
Same situation, same resolution. Removed tube, stuffed in piece of napkin, pushed through. No debris etc noted. Cleaned ectrodes with brass brush, brushed where screw on tube connected to burner chamber. Loosened attaching screw for electrode,wiggled it around and retighten electrode. Reinstalled tube and it worked. Not 1st time I've had to do this
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2016 Flagstaff 27VRL Emerald
14K Equalizer
2020 Silverado 2500HD CC 4X4 6.6L gas 3.73
But you get the gist.
Linear Mode
