Furnace Thermal Coupler

Most gas furnaces use either a flame sensor or a thermocouple often referred to as a thermal coupler both are safety devices that sense the presence of a flame and control the flow of gas to the appliance accordingly.

Furnace thermal coupler. Honeywell cq100a1013 u not available cq100a1013 24 inch replacement thermocouple for gas furnaces boilers and water heaters quot 4 5 out of 5 stars 191 8 62 8. If the pilot lights but won t stay lit the thermocouple is probably bad. Honeywell home cq100a1039 u cq100a1039 replacement thermocouple for gas furnaces boilers and water heaters 30 inch 4 7 out of 5 stars 80 9 31 9. If no flame is present the sensor stops or prevents the flow of gas from the gas valve thus preventing the dangerous situation of gas flowing into the appliance when there.

In fact the problems that affect gas furnaces typically involve the furnace s thermocouple the pilot light or some component of the electrical system. The thermocouple is a safety device located by the pilot light on your furnace. Every gas appliance with a standing pilot that cycles on and off needs a thermocouple. If it accumulates soot it can give off a faulty reading and shut off the furnace.

Natural gas and propane burn cleaner than fuel oil and most gas furnaces present fewer operational difficulties than oil burners do.