Raypak 406a burner issue


New member
Jun 3, 2012
Purchased Raypak 406A Heater(millivolt) in 2008. Last year we had the local shop work on it to repair a cracked weld to fix the front left burner bracket.
This year when trying to fire it up, we had a flame out the left side that popped the thermal fuse, as that is where the flame went to. Since we have a pine
tree that is too close, we pulled it apart to clean out the junk, and make sure the air flow is good. There was some debris on the heat exchanger, which has now been
cleaned off. When pulling the burner to make sure that was clean, we noticed that the 4 nuts/bolts that hold the burner in place to the bracket was only finger tight, so
it possibly shifted. When we pulled the burner out, that since new, only the back half of the burners are lighting, and that the front of the burner rails are clean and shiny
except for one rail which lights. My question is, is this normal, and has anyone else experienced this?

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New member
Jun 3, 2012
I found a dead spider with web in the last burner tube so that should be my flame out the side. I still wonder about uneven burn on the burners. What I didn't say was that I'm in Colorado so I'm at 6,700 feet.


TFP Expert
In The Industry
Jul 6, 2011
So you're saying that when the unit is lit, and you look at the burners while burning, there is no flame on the front portion of the all burners?