Is fuel getting to the nozzle? With the top of the heater removed, use a flashlight to look for fuel spraying from the nozzle. If it isn't, check the fuel filter. Have you check you air pressure going to the fuel nozzle? The required pressure should be listed on the data plate of the heater. If you can't get the air pressure right, your air filter could be the problem. Let me know what you find if this doesn't fix it.
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