Thermopile Voltage Low On Water Heater. This gas valve is commonly used on ao smith, state, whirlpool, and rheem water heaters. You head to check the heater one last time and discover that the pilot light is out.

Since almost all major brands of atmospherically vented water heaters have switched from a thermocouple to. And how severe is the problem? The most common situation that causes this problem is a bad thermopile.