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Most common cause of pilot light problems is air movement. If your space heater exhausts gas through the roof, ensure the cap is on and level. If not, outside air movement will blow out the pilot. If you do not have an exhaust gas duct, check that the unit is positioned so that it does not blow air back onto itself from walls, furniture, etc, and ensure no other devices that move air are aimed towards the unit. The unit also needs to be placed away from central ducting, including return vents.
Hi Rob, The number you have listed AUW230A may be the model number. You say its a central heat so, If it is a package unit, the model, serial, and all of the ratings would be on the unit near the elect box on a package unit.I do know by the # you gave me it is a Vulcan 3000 watt thermostatically controlled Immersion heater. Here is a link I can give you, they deal with this heater for parts Ect. that maybe of help to you, it is www.grainger.com. There are many model # and I believe this is it, AUW230A. I hope this helps Rob, Sincerely, Shastalaker7
Flame rollout sensors, overheat thermistor, air proving switch, bad earthing, blocked flue. Any of these things can cause your problem. If its a permanent pilot, is it clean burning?? If electronic ignition, is the flame rod clean i.e. no carbon or rust etc..
Safest bet is a qualified gasfitter take a look at it.