Purchasing A Replacement Thermocouple Or Flame Sensing Rod Applicable To Your Particular

Hardware stores may carry many universal Thermocouples on hand. If you will be purchasing a flame sensor, refer to your owners manual as it will
have to be specific to your furnace type.

Ready to buy a Flame Sensor at wholesale price?
(We have no personal or financial affiliation with this company...just a recommendation).

Thermocouple Replacement:

*** You must change a bad thermocouple as soon as possible ***
After you replace it, rest easy knowing your furnace is working properly and safely.

Hardware stores may carry them on hand.


Things You'll Need:
Replacement thermocouple

Replacing a thermocouple is fairly easy if you follow these steps:

Step 1
Shut off the gas valve and power for the furnace. Remove screws from the front panel and remove, exposing an upper and lower panel from
which you can access the thermostats. Unscrew top front panel, and remove to access the thermocouple block.

Step 2
Locate the thermocouple next to the pilot light. Disconnect the thermocouple by removing the copper lead, unscrewing the gas line connection nut
and the bracket nut holding the thermocouple tube in place. The nut is located underneath the mounting bracket.

Step 3
Replace the old thermocouple. Remove it, and slide the new thermocouple into bracket hole with the steel tube facing up and the copper tube facing
down. Tighten bracket nut underneath bracket to secure tube.

Step 4
Connect the copper lead to the gas line. Tighten the connection nut. Make sure the connection is clean and dry. Hand-tighten all the nuts. To
replace the lower thermostat, remove lower access panel and repeat steps.

Step 5
Turn on the gas supply to the furnace. Relight the pilot light by following the furnace manufacturer's instructions. Make sure the pilot light stays lit to
ensure the new thermocouple is working properly. Replace the door.

Tips & Warnings

You must change a bad thermocouple as soon as possible.

Make sure you have the correct replacement thermocouple. Check the furnace manufacturer and model and call the manufacturer for the right part

If the connections or parts around your thermocouple are dirty, clean them after taking out the old thermocouple and before inserting the new one.

Thermocouples can be very hot from the pilot flame and cause burns, so be careful.

This is also a good time to look for any other parts that may be damaged or worn and to inspect the functioning of the pilot.
Make absolutely sure
that you do not begin replacing the thermocouple prior to shutting off of the gas, as you could breathe in gas and be asphyxiated or
cause an explosion. If you smell gas prior to beginning the replacement, hold off on the work and call in a professional to see if you
have a gas leak, making sure you're out of the house.

Flame Sensor

What Is A Flame Sensor?

First, for those of you who might not know, "What is a flame sensor?" a flame sensor is a safety device. When your furnace's main
burners ignite (light up) the flame sensor picks up the heat from the furnace's main burning and says, "YES,"  and sends a signal back to
the main furnace control board saying that it is OK to let the main burner stay on.  Or if the main burners do not ignite, the flame sensor
does not pick up the heat and says, "NO" to the main control board, "Shut that gas valve and main burners down"! Thankfully we have
safety controls like the flame sensor.  Most of the time, after turning your furnace's power off, you may clean the flame sensors with light
sand cloth, emery cloth or steel wool. Reinstall the flame sensor and you are back in business! Over the years flame sensors can build
up a light coating of burned-in dust and dirt. This insulates the flame sensor so that it doesn't sense the heat of the flame well enough, so
by cleaning it, you have almost restored it to its new condition. Seldom, but sometimes they do go out completely.

How To Clean A Flame Sensor


Things You'll Need:
Steel wool or sandpaper

Step 1
Most importantly, shut of the gas! Turn the furnace off. It can be turned off using the switch on the unit or by cutting the power source at the
breaker box. Let it cool down so parts won't burn you.

Step 2
Locate the flame sensor. It is the metal rod located in the direct path of the burner with a wire attached to it. Often, it has a white ceramic base.

Step 3
Remove the sensor (if possible) by removing the screws and pulling the wire off. In addition, unscrew the bracket holding the flame sensor in place
and remove it from the furnace.

Step 4
Clean the surface of the sensor by wiping with sandpaper (approximately 400 grain) or with steel wool. If you do not have either available, it can also
be gently scraped with a knife to remove the build up and debris.

Step 5
Once clean, reinstall the flame sensor directly back into the location from which it was removed. Once secured, turn power to furnace back on and
test the furnace to ensure it turns on properly. If the sensor is still dirty, the furnace will shut off after a couple of minutes. Repeat cleaning again.

Steps To Replace Your Flame Sensor:


Ready to buy a Flame Sensor at wholesale price?
(We have no personal or financial affiliation with this company...just a recommendation).

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How To Replace A Thermocouple Or Flame Sensor