Yes, I would say, it's possible. Try emptying the tank and see if you hear any ratting inside the tank, when you shake it. Once the pressure is off the tank, any debris may fall back into the tank.
You may also want to check the fuel filter for dirt and debris, as well as the air intake filter.
Also, there may be air in the lines.
In checking the Owners Manual for your model heater, there's not much there, as far as Trouble Shooting is concerned. Never the less, I am providing a link to it, You can download and print it for future reference, if you so desire.
http://www.desatech.com/manuals/Construction%20Heaters/000228-01.pdfI hope this gets you started in the right direction.
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