Why Do Heating Elements Burn Out? 6 Common Causes
A heating element is just resistance wire that glows hot when current passes through it. Over time it degrades — but certain conditions make it fail far sooner. Here are the usual culprits.
1. Normal oxidation
Every heat cycle thickens the oxide layer on the coil until the wire thins and finally breaks. This is unavoidable wear, but everything below speeds it up.
2. Overheating from poor airflow
A clogged filter, weak blower, or blocked vents trap heat around the element, pushing it past its rated temperature. This is the most common preventable cause in furnaces and HVAC.
3. Voltage problems
Over-voltage runs the element hotter than designed; under-voltage and surges stress the metal. Both shorten life.
4. Frequent on/off cycling
Each start-up thermally shocks the coil. Short-cycling equipment wears elements quickly.
5. Bad connections
A loose or corroded terminal creates resistance and heat right at the joint — often killing a brand-new element. Always check connections on a replacement.
6. Contamination
In kilns, glaze and flux vapors attack the coil. In furnaces, dust and debris bake onto the element.
Make your replacement last
Fix airflow, tighten connections, and match the correct spec. Need a replacement? Send us your make and model — shipped across Canada.
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- DIY vs. Hiring an HVAC Contractor for Element Replacement
- Heat Pump vs. Electric Furnace: Heating Costs in Canada
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