Unit is not new (I bought it 5 years ago) but has never been used. I have a 100lb bottle and a 25 ft hose off the regulator connected to the unit. The pilot will light but the flame is extremely small and doesn't come anywhere near the thermocouple. I tried adjusting the regulator but I can't get the size of the pilot to change. If I heat the thermocouple with a lighter the main gas will come on but the unit goes out as soon as the thermocouple cools off.
There is really not a lot to go wrong with the heater itself so my first guess would be that the regulator is bad, not letting the proper amount of gas through. You can check it for leaks with a bottlee of soapy water but even if you don't see a leak there is a rubber gasket inside with a pressure spring that is probably bad.
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I just had this problem, which might be the same. It is the thermocoupler, which DESA tells you they no longer have. So I had to buy a new one, and did not buy from DESA. Mine was only 6 years old and used once in a while.
Mine was lighting fine but wouln't stay on so I cleared the air vent in the side of the piolt. worked fine the first time. now won't light at all.
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