How to Replace a Gas Fireplace Thermocouple: Step-by-Step Guide

By Fireplace Choice March 19, 2026 | DIY repair gas fireplace how-to millivolt replacement guide thermocouple | 0 comments

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:...