![pilot thermopile](https://images-na.ssl-images-amazon.com/images/G/01/x-locale/common/grey-pixel.gif)
The Thermopile is a kind of temperature sensor that can get signal from the heat and creat voltage to open and close the valve and let the heater gas in and close.
The neccessary working temperature of the thermopile which need to reach 750mV is required 1202°F temperature heating.
So if the valve cannot be opened, you may need check if the temperature of flame is enough , sometime need replace orifice or pilot.
Compatible with Whirlpool Water Heater Parts
Compatible with Whirlpool Model: N30T61-303, N40T61-403, N40T62-403, N50T61-403, N50T62-403, N50T91-403, N40T61-353, N40S61-403, N40T121-403, 40S6-40NG, 40T6-34NG-400, 40T10-40NG-400, 50T6-40NG-400.
Compatible with American Water Heater Model:
N30S61-303, N30T61-303, N40S61-403, N40T61-343, N40T62-403, N40S91-403, N40T91-403, N40T121-403, N50T61-403, N50T61-504, N50T91-403, N50T122-403, BFG6140T403NO
Compatible with AO Smith Water Heater Thermopile
Compatible with AO Smith Series: GS6-300, GCV-300, GPX-300, GVK-300, XCZ-300.
Compatible with Reliance Water Heater Parts
Compatible with Reliance Model: 630 lort/lors 301, 630 loct/locs 401, 640 lort/lors 301, 640 loct/lbcs 401, 650 lort 301, 640gort 300
Compatible with kenmore water heater pilot assembly
Compatible with Kenmore Model:153330230, 153330250, 153330270, 153330290, 153331150, 153331492, 153331592, 153331620, 153331630, 153331640, 153331651, 153331661, 153331670, 153331682, 153331830, 153331840, 153331851, 153331861, 153331882, 153332421, 153336930, 153336931, 153336940, 153336941, 153556300, 153556400, 153556500, 153559400, 153559500, 153572400, 153572500, 153573400, 153576300,153576310,153576320, 153576400, 153576410, 153576420, 153576500,153576510, 153579400, 153579410,153579420, 153579500, 153579510.