What Are the Common Symptoms of a Bad Thermocouple?
Learn the key symptoms of a bad thermocouple, including pilot light issues and heating failure, and how to fix them efficiently.
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Symptoms of a bad thermocouple include the inability to light the pilot light, a pilot light that keeps going out, or a furnace that fails to heat. Thermocouples work by sensing the heat from the pilot light and opening the gas valve; if they fail, the gas valve stays closed as a safety measure, preventing your furnace or water heater from turning on. If you notice these signs, it's often a straightforward fix to replace the thermocouple and get your system back up and running efficiently.
FAQs & Answers
- What causes a thermocouple to fail? Thermocouples can fail due to wear and tear, dirt buildup, corrosion, or damage from frequent pilot light outages.
- How do I test if my thermocouple is bad? You can test a thermocouple with a multimeter to check voltage output or observe if the pilot light stays lit consistently.
- Can I replace a thermocouple myself? Yes, replacing a thermocouple is often a straightforward DIY task, but make sure to follow safety precautions and consult your furnace’s manual.
- How much does it cost to replace a thermocouple? Replacement parts typically cost between $10 and $30, with professional labor varying depending on location and service provider.