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No this is not normal .The pilot should lite first then when you hold button down until thermocouple sense the flame and tell pilot to stay Lit .
I think you should change out the whole pilot assembly.
Does this pilot needed to be lit manually or has a sparker
Most often, this is a faulty thermocouple. Replace it, but first be sure the pilot flame is actually heating the thermocouple. If it is not, it will not stay lit. Sometimes they fall down out of it's holding bracket or just go bad. A lazy yellow pilot flame means the pilot orifice is dirty and needs to be cleaned. If the pilot flame is a string blue color, then replace the thermocouple.
Thermostat flame sensor. Do you see a little rod next to the pilot? That is what tells the main gas valve that the pilot is lit and it is safe to give gas. Easy swap, and you can usually just pick up a generic one.
I would remove pilot light assembly and clean orifice and blow out gas line to pilot. Check to see that thermocouple is centered in pilot flame. It is possiblethat your gas valve is bad but it is also possible that you got a defective thermocouple. I would change the thermocouple again as they are much less expensive then the gas valves. The next time when you are sure you have the thernocouple mounted as close to the center of the pilot flame hold the pilot button down for several mins. If none of this works then you may have to change your gas valve.Thank you.
If your pilot light will not stay lit when you release pilot light button then chances are that your thermocouple is bad. Make sure that the tip of thermocouple is directly in line with pilot light. Tip of thermocouple should be cherry red if it is properly placed. If pilot will not stay lit then replace it. If you aren't sure about placement of thermocouple you can heat thermocouple with a seperate heat source. If you do this and pilot light stays lit then reposition thermocouple in pilot flame. If it still won't keep pilot burning then replace thermocouple. Hope this helps. Thanks.
The thermocouple is what tells the gas valve to supply or not supply gas. Several things can cause the thermocouple to malfuntion.
1. pilot light jet is clogged and will not allow the pilot light to reach and heat the thermocouple. Repair by cleaning the pilot light jet out.
2. corrosion on the thermocouple which will also not allow the flame from the pilot to heat the thermocouple properly. Repair by sanding the thermocouple lightly with sandpaper
3. Thermocouple is bad and needs replacement.