How To Test Furnace Flame Sensor With Multimeter

How To Test Furnace Flame Sensor With Multimeter. How do you test a flame sensor? If there is no difference between the readings, a.

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Locate and unscrew the furnace flame sensor to carefully remove it. How long do furnace flame sensors last? Most flame sensors have a coating on them to keep them clean;

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The flame sensor is usually found on the back side of your furnace. Turn off the power and the gas.

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Repeat these steps along the various sections of the circuit between the source and sensor to isolate the problem. Then carefully pull it out.

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You can use a lighter or some other heat source that has a flame on the opposite end of your thermocouple. The device should read a high resistance.

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A bad sensor will surely not work. Start by placing one of the test leads on the thermocouple side and the other end that enters on the side of the gas valve.

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There should be a little panel that you’ll need to remove to gain access to the sensor. Once you locate the sensor, proceed as follows;

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The flame sensor is usually found on the back side of your furnace. How long do furnace flame sensors last?

Replace The Flame Sensor, Drive The Screw To Hold It And Turn On The Power.

Use a screwdriver or wrench to unfasten the screws holding the flame sensor in place. Locate and unscrew the furnace flame sensor to carefully remove it. An individual could test a furnace flame sensor by using a multimeter to measure the resistance of the sensor.

Then Carefully Pull It Out.

This means you need to disconnect the wire from the rod, connect one multimeter lead to the rod and connect the other to the wire you removed from the rod. Connect it to the wire leading to the gas valve Simply rub the emery cloth over the probe until the soot is gone, and the metal is more or less shiny.

Repeat These Steps Along The Various Sections Of The Circuit Between The Source And Sensor To Isolate The Problem.

If the multimeter does not register a reading, then there is something wrong with the wiring. If you can see a thin piece of wire that ends in the flame area, that’s likely the sensor. If cleaning the flame sensor doesn’t work for you, then see if the flame sensor is okay.

If There Is No Difference Between The Readings, A.

The sensor is usually located on left side but on some furnaces it may be on the right side. Video narrated by pci online hvac, lead faculty, bret doles. The word of advice video explains what the multimeter is capable of doing and then shows how each of the functions of the multimeter is used in troubleshooting and testing a furnace.

Take A Multimeter With Microamps (Μa) Measuring System;

Continue with touching the probes to the wire and blue ports on the flame sensor. This process can (and should!) also be performed with your sensor’s communication wiring. If it doesn’t, it’s best to wait until you can replace it, even if you have to spend a night in the cold.