I have an "ALL-PRO' bullet heater (50,000 to 85,000 BTU) that will fire up, but it fires up like a real big burst like it always did when holding the igniter, then cuts way down within 2 seconds to a low fire about two(2) inches in diameter, looking in from the front. Won't stay lit after I release the igniter. Guess it isn't enough fire to keep the thermocouple hot. Anyone have this problem or any suggestions?
Thanks in advance.