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It sounds like you have a direct vent heater so you have to take off a pilot access cover to light the pilot. So what happens is the draft coming out of the cover is blowing out the match before you get it in the hole. The trick is to get the match or lighter in the hole quickly as possible so the pressure inside the heater will equalize and the match will stay lit. Then you should be able to lite it. Get it inside the hole fast and it will work. Don't forget to put the cover back over the pilot access or the draft may cause the pilot to go back out.
sounds like an obstruction in pilot assembly.try using canned compressed air to blow directly into pilot. this technique is successful about 70%. if not,pilot assembly must be removed and cleaned thorougly
Sometimes you have to completely disassemble the pilot assembly to clear the blockage, the orifice for the pilot jet is very small and you can not get directly to it unless you take it apart. If this does not help, you may need a new valve.
I have several of these heaters in my rent houses and love them. The most problem I have is not being able to ignite the pilot with the user control igniter. Remove the screws that hold the front cover in place along with the front cover. Hold the pilot control down and ignite with a lighter. Keep the pilot engaged until thermocouple is warm enough to keep pilot gas flowing. If it will light this way then you need to blow out the pilot orifice. It seems that every year I have to go in after the summer season when the heater is off and clean the pilot/orifice lines with high pressure air. I believe spiders/bugs/dust block pilot orifice when it is not in use. You can also tell that orifice is blocked when you don't get a good blue pilot flame with pressure behind it allowing the flame to submerse the thermocouple. If the the thermocouple is not getting enought heat it will turn pilot gas off for safety reasons.
the pilot light is operated off a millivolt generator. that is the small tube directly in the pilot flame. its purpose is to generate a small dc current which is connected to the pilot valve inside the main valve. setting the control to pilot opens just the pilot gas supply. when operating normally the millivolt generator keeps a small electromagnet pulled in that keeps the pilot gas supply open. if it don't work the pilot gas supply valve closes. replace the thermocouple.