Furnace Thermal Coupler

If the pilot lights but won t stay lit the thermocouple is probably bad.

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. 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. Every gas appliance with a standing pilot that cycles on and off needs a thermocouple. This device generates a small electric signal to keep the gas valve open when the pilot is on.

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. In fact the problems that affect gas furnaces typically involve the furnace s thermocouple the pilot light or some component of the electrical system. You can test it with a multimeter. Fortunately cleaning a thermocouple is a repair most handy homeowners can do themselves.

The thermocouple is a safety device located by the pilot light on your furnace.