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SIT 820 Nova Millivolt Valve Troubleshooting
The SIT 820 Nova mV is a millivolt gas valve for standing pilot gas fireplaces, log sets and space heaters. The pilot burns all the time and its thermopile powers the valve, so the fireplace works without house power. Your fireplace's parts list may give the valve under the fireplace...
How to Test a Fireplace Thermocouple and Thermopile (Millivolt Readings)
A standing pilot (millivolt) gas fireplace runs on power made by its own pilot flame. The thermocouple holds the gas valve's safety magnet open so the pilot stays lit, and the thermopile powers the valve that lights the main burner when you flip the wall switch or press the remote....
Millivolt vs Electronic Ignition Gas Fireplaces: What's the Difference?
If you own a gas fireplace or you're shopping for replacement parts, you've probably encountered the terms "millivolt" and "electronic ignition." Understanding which type of ignition system your fireplace uses is essential for ordering the correct parts, troubleshooting problems, and understanding how your fireplace operates.This guide explains both systems in...
How to Replace a Gas Fireplace Thermocouple: Step-by-Step Guide
The thermocouple is the copper-lead sensor in your gas fireplace's pilot flame that keeps the gas valve's safety magnet open. When it wears out, the pilot lights while you hold the knob in but goes out when you let go. Gas fireplace thermocouple replacement is one of the simpler repairs:...
Gas Fireplace Pilot Light Won't Stay Lit: Causes and Fixes
On a standing pilot (millivolt) gas fireplace or gas log set, the pilot stays lit only while the pilot flame heats the thermocouple enough to hold the gas valve's safety magnet open. When the pilot lights while you hold the knob in but goes out when you let go, Heat...
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SIT 820 Nova Millivolt Valve Troubleshooting
Oct 28, 2026 -
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