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I can't say for sure without a model number but on some new water heaters you have to replace the entire pilot assembly not just the thermocouple. Why do you want to change it?
Model gcv 40 100
The pilot will not stay lit
Owner has been lighting it constantly and now the auto light for the pilot wont work either
The only time the thermo needs to be replaced is if the pilot goes out when the pilot light button on the gas valve is released after the pilot is re-lit. The pilot could be going out because the air intake vents are clogged. If they are there is turbulence whenever the main burner shuts down which can put out the pilot. If the piezo igniter isn't working either then replacing the pilot assembly may be the best option but before you do I would make sure the pilot burner orifice is not clogged. You should pass a tiny wire through it even if you can see daylight through the tiny hole in the orifice
Why does the thermocouple have a transister in the line and can I replace it with one from a hardware that does not have the transistor?
IF I NEED TO, That is
No you can
can't replace it with a generic universal thermocouple.
sorry I hit enter inadvertantly
Ok, would you possibly have the part number for the pilot assembly?
Give me a minute to look it up. But before you go and replace it I'd try cleaning the pilot orifice. Of course if you replace the assembly then that won't be necessary.
This is a natural gas water heater.
I know, back in a few
Ok, first the 'transistor' is a thermal cut out device so if it has 'tripped' you'd have to replace the pilot assembly anyway. Be sure the intake vents are clean and the flue is clear just in case. There is no specific part number for the pilot assembly that I can locate. Go to any plumbing supply house that sells AO SMith and ask for the pilot assembly. You'll need the model and serial number.
Thanks for your help.