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It's a burner control problem. It maybe a defect on some protective devices (pressure switch, fire detector, etc.), a blown fuse, or a board defect (busted DC supply transformer, relays, or electronic devices).
sounds like the part he cleaned should get replaced, have him come back and replace the part instead of cleaning it, we some times clean it hoping to save time and money, but if that doesn't fix it it should be replaced.
the flame is probably too high and causing a lot of carbon to build up behind the flame shield you are gonna have to remove the burner chamber and clean and the adjust the flame by the screw on the back plate. Screw it in to increase flame and screw out to reduce.
you need to replacve the air filtration filter. the unit must draw in dilution air to burn the fuel. It's located on the back of the heater near the fan. usually to the right side.
CookHVACR
Here is a picture I found that shows the jumper settings for: Quantum Fireball CR
Quantum Fireball CX
Quantum Fireball EL
Quantum Fireball EX
Quantum Fireball LCT08
Quantum Fireball LCT10
Quantum Fireball LCT15
Quantum Fireball Plus KA
Quantum Fireball Plus KX
Quantum Fireball SE
Quantum Fireball ST
Quantum Fireball LM
Quantum Fireball AS
starts popping and I get an occasional fireball out the pipe. I checked the coil and the rectifier both of which are working fine and I put in new plugs in before the test and then swithced them to make sure it wasn't a bad plug. Any ideas? Maybe a valve issue? I think I'd do a compression test now. That might help steer you toward a solution.,
Here is a picture I found that shows the jumper settings for:
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