Several thoughts on this heater Fuel delivery system, the fire eye sensor or dirty intake filter. These are the most common problems that I run in to with these heaters. Start by taking off the top half of the heater tube. Find the nozzle unscrew it and clean the screen in behind the nozzle, inspect the nozzle for corrosion or damage. If you see any restriction replace the nozzle pay attention to spray angle and GPH rating this is printed on the nozzle. They say you should not clean the nozzle because you can damage them, well carb cleaner q-tips and a tooth pick seem to work well and not cause damage. Locate the flame sensor these get a dirty lens and can shut down heaters as well. Try cleaning with windex and soft terry cloth rag, works wonderful.Back to fuel system inspect the fuel line look for holes dry rot or restrictions.Remove the screws on the side cover to expose the wiring and fuel line with filter to fuel tank. Remove the filter and clean it I use compressor and an air blow gun and blow backwards thru the filter cleans it right out.Inspect it and the lines reassemble and at the back opf the heater is a sponge type filter remove it. This is a foam filter wash it out, dry it real good put it back in and fire it up. Take your time pay attention to detail and this should help your ailing heater.
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