Signs of a Failed Heating Element

Water heaters

No hot water at all. Usually the upper element. The upper element heats first and controls the sequence, so when it opens, the lower element may never get a call to run. Check the high-limit reset button first — it is a red button on the upper thermostat, and if it has tripped, pressing it costs you nothing.

Hot water runs out unusually fast. Usually the lower element. The top of the tank still heats normally, so you get a normal-feeling first draw that turns cold much sooner than it should.

Lukewarm but never properly hot. Often one element running alone, or a thermostat out of calibration. Test both before assuming.

Breaker trips. A shorted element leaking to the tank. Test resistance to ground. Do not keep resetting the breaker — it is doing its job.

Electric furnaces

Blower runs, air is cold. No heat stage is energising. This is either burned-open elements, a failed sequencer, or a tripped limit switch — and separating those is worth ten minutes before ordering anything. See our element versus sequencer guide.

Weak heat that never satisfies the thermostat. One stage of a multi-stage kit has opened while the others still fire. Easy to miss, because the furnace does produce heat — just not enough. Test each stage individually.

Breaker trips shortly after heat starts. Either a shorted element, or a sequencer that has failed closed and is bringing every stage on simultaneously instead of staggering them.

Heat pumps

House will not hold temperature in deep cold. The heat pump cannot cover the load alone below its balance point, and the auxiliary strips are not making up the difference.

Cold air during defrost. In defrost the system runs in reverse and relies on the strips to temper the supply air. Dead strips mean cold air straight into the house.

Emergency heat produces nothing. Emergency heat runs on strips alone with the compressor locked out, so if nothing warms, the fault is in the strip circuit. This is also the cleanest way to test strips deliberately.

Kilns

Firings getting progressively longer. The classic ageing signature, and the most useful early warning you get. Element wire oxidises, resistance climbs, heat output drops. Nothing has broken yet — but it will.

Kiln stalls before reaching temperature. Elements have degraded past the point where they can hold the top of the ramp, or the controller has errored on a rate fault.

Uneven firing top to bottom. One ring has aged faster than the others. Top and bottom rings typically work hardest.

Visible break or bright spot. Burned through, or a thinned section running hotter than the rest. Replace the whole set.

Faults that imitate a dead element

Before ordering, rule these out:

• Tripped high-limit or reset button — free to check, and surprisingly often the whole problem
• Failed thermostat — the element is fine but never gets told to run
• Failed sequencer — extremely common on electric furnaces and heat pump strips
• Tripped breaker or blown fuse — check the panel before the equipment
• Loose or burned terminal connection — resistance at the connection rather than in the coil, often visible as scorching
• Restricted airflow — causes limit trips that look like heating failures, and destroys elements over time
• Control board fault — nothing gets a call to run