Hi, my name is Mike and I have been in the home improvement and repair field for 20 years. I will be very glad to help you today. If you have not cleaned the appliance that may be the issue.
1) Remove the front casting by unscrewing the 4 wing nuts located inside the cylinder chamber and lifting the front casting away.2) Check that the burners primary air inlet is not blocked or obstructed. If it is, remove particles
3) Using a soft brush, clean the top of the burner mesh.Then using a vacuum,remove any dust/debris from the burner mesh.4) Finally, using pressurised air - blow out the burner. First through theprimary air inlet and then through the top burner mesh.
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