Staff Answer
Sep 28, 2026 - 07:39 AM
40 mV is a good reading, so the thermocouple is producing enough voltage. If it won't stay lit with that, the problem is most likely the magnet in the gas valve, or a bad connection where the thermocouple screws in (or at an interrupter/extension, if you have one). Clean and snug those connections first. The N145 gas valve (625688-07) is discontinued now, though.
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