Test a Thermopile on a Water Heater | Honeywell Gas Valve

I'll show you how to test a thermopile on a water heater that has a Honeywell gas valve. The thermopile should test out between 650 to 850 millivolts if it's good and working.

If you have a Reliance water heater and need a thermopile, it's cheaper to purchase the entire pilot assembly, which includes the thermopile, pilot and igniter, on Amazon than it is to purchase the thermopile alone. The assembly includes the pilot tube.
Reliance Water Heater 9007876 Gas Thermopile Assembly: https://amzn.to/3p8xHkx
I used a Harbor Freight 7 Function Digital Multimeter. It's about $7.00 at Harbor Freight.


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