Where is the thermocouple on my RV furnace?

Inside the main burner there will be an assembly containing both the thermocouple and the pilot flame burner. The thermocouple is cylindrical and sits in the pilot flame; hence it will be the topmost of the pilot burner/thermocouple combination.

What are the symptoms of a bad thermocouple?

If you can’t get the flame to light at all, and you’re sure the gas is on, there’s probably an obstruction in the pilot tube. If the flame lights and goes out when you release the gas control knob after holding it in for the recommended 20 to 30 seconds, that’s the sign of a thermocouple malfunction.

Can I replace a thermocouple myself?

The No. 1 cause of pilot lights that won’t stay lit is a worn-out thermocouple. It’s easy to replace and a new one costs $5 to $10. Rather than trying to unfasten the thermocouple inside the water heater’s burning chamber, it’s easier to remove the whole burner and thermocouple assembly.

Is a thermocouple the same as a flame sensor?

THERMOCOUPLE. People tend to use the terms “flame sensor” and “thermocouple” interchangeably. … If your furnace uses an electronic controller, it’s got a flame sensor. Thermocouples are used on standing pilot furnaces that have pilot lights.

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How do you trick a thermocouple?

The thermocouple always thinks the pilot is not lit, even if it is. To get hot water, I have to light the pilot, then hold the match on the thermocouple to trick it into thinking the pilot light is touching it. Once it’s warm enough, I pull the match out and turn the knob from “Pilot” to “On”.

Can a thermocouple be cleaned?

Yes, you can clean a thermocouple, but the task must be done with a light touch. Remove the thermocouple from the process assembly, using a steel wool or emery cloth, lightly clean the tip removing any build up.

Can you bypass thermocouple on furnace?

Realistically, you have just disabled the thermocouple, but you can also reach in and unclip it from its holding bracket where it meets the pilot light. In most cases it will be held on with a gravity clip, but some are held on with a screw that must be removed with a small screwdriver.

Why is my travel trailer furnace not working?

One other RV heater troubleshooting tip is: check the thermocouple. Be sure it is clear of any spider webs or insect nests. The thermocouple needs to be in the correct position in the burner to work correctly. If the thermocouple is bad, remove it and buy one exactly the same as the one you are replacing.

What is a RV thermocouple?

The thermocouple is an electo-mechanical safety device that senses if the pilot flame in an RV appliance is present. … When lighting the pilot flame, allow the thermocouple to heat up for 30 seconds or so before releasing the valve button.

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What is a sail switch on a RV furnace?

The job of the sail switch is to tell the system that your fan is spinning fast enough then it sends the propane to be ignited. This is done as a safety precaution for your RV won’t catch on fire.

Who replaces thermocouples?

Honeywell, White Rodgers, and other manufacturers make universal replacement thermocouples, usually with a 30-millivolts (mV) rating for standing-pilot furnaces.

How much is a new thermocouple?

It costs $150 to $250 to replace a thermocouple. It checks to make sure the pilot light is on. It will shut the gas off if it’s not.

What causes a thermocouple to go bad?

Changes in temperature can cause regular expansion and contraction in metal, which will cause thermocouples to weaken over time. After enough time, metal fatigue can cause a thermocouple to break. … If thermocouples start to give out unusual readings, it may be suffering from metal fatigue.

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