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'''Dirt in Heater Components'''''Illustration: This may be the most common cause of a pilot that burns for a few minutes then goes out. Even partial blockage of the Pilot Air Inlet Hole will result in an unreliable pilot. When the pilot goes out, even when the main burner is still going, the thermal coupler safety will cut the gas supply to the main burner. Keep the entire pilot assembly clean for reliable performance.''''Illustration: This may be the most common cause of a pilot that burns for a few minutes then goes out. Even partial blockage of the Pilot Air Inlet Hole will result in an unreliable pilot. When the pilot goes out and the main burner is still going, the thermal coupler safety will cut the gas supply to the main burner. Keep the entire pilot assembly clean for reliable performance.'' '''Gas Pressure''''''Altitude'''If you have hooked the heater up to the wrong gas type, you may have this problem. Check your gas supply.'''Ventilation''' '''Cleaning is Important'''MAIN BURNER'''MAIN BURNER'''AIR PASSAGEWAYS'''AIR PASSAGEWAYS'''