When to Replace Kiln Elements and How to Tell
Replace kiln elements when testing confirms they’re damaged or no longer perform reliably; there’s no universal replacement interval for every kiln. Longer firing times or trouble reaching temperature can signal wear, but they can also point to a relay, connection, or power problem. A dark-looking element alone doesn’t settle the decision, so check it against your kiln maker’s guidance.
When should you replace kiln elements?
Quick answer: Replace them when an element is visibly broken or a resistance test shows it exceeds the limit for your exact kiln model. Let the kiln cool and disconnect power before inspecting or measuring resistance. If only one element has failed and the others are in good condition, replace that element; replace the full set if the elements are visibly deteriorated or your kiln requires it.
- Let the kiln cool, then unplug it or switch off the breaker before inspection or testing.
- Check for broken elements, cool or dark spots, sagging coils, contamination, and poor connections.
- Measure resistance with an ohmmeter and compare it with the factory value and replacement limit for your kiln model.
- If a whole section is dark, check its relay or switch before replacing elements.
How Can You Tell Kiln Elements Are Failing?
Gradually longer firing times or a kiln that can’t reach its target temperature can point to aging elements, especially when both symptoms develop over time.
Look for these signs:
- Slow firing: Firing times keep increasing or the kiln struggles to reach temperature.
- Cool or dark spots: A glowing element has sections that don’t glow.
- Sagging coils: Elements hang down or have uneven spacing between coils, which can indicate deterioration.
These observations can help you decide when to replace kiln elements, but check the cause before ordering parts. An Error 1/E1 code means the kiln is slowing and failing to reach temperature; it can result from aging elements, failed relays or contacts, or low supply voltage. The code alone doesn’t confirm element failure.
A dark kiln section also needs further diagnosis: check its relay or switch rather than assuming the element has failed. Uneven firing results alone aren’t enough to identify a bad element, because kiln loading and power supply can also affect firing. If slow firing or visible wear raises concern, an element resistance check compared with the factory value for your exact kiln model can help confirm whether replacement is warranted.
What Changes How Long Elements Last?
Higher firing temperatures and longer holds shorten kiln-element life, while high-temperature firing and holding can also make elements sag or creep. Hotter firings and longer holds put more strain on elements, so your firing schedule affects how quickly they wear.
Contamination and firing atmosphere matter, too. Silica-bearing glaze or kiln wash, clay, lead-glaze vapors, and reduction firing can damage elements. Keep element grooves clean and vent the kiln to help limit damage.
Skutt’s school-program estimates are about 800–1,200 firings for low-fire work and 40–60 firings for mid/high-fire work, but those figures apply to that program’s guidance, not every kiln. Use them as context, not a countdown: your kiln’s firing conditions and element performance matter more than a general firing count.
How Do You Check Elements Before Replacing Them?
Check kiln elements in order: disconnect power, inspect the cold elements and connections, then compare resistance readings with the kiln manufacturer’s limits before deciding whether to replace them.
Cool the kiln and disconnect power. Wait until it’s cool, then unplug it or switch off the breaker or disconnect before opening the kiln or measuring resistance.
Inspect each element and its connections. Look for a visibly broken element, contamination from clay or glaze, and poor electrical connections. A broken element is a clear sign of damage, but contamination or a connection problem can also affect element performance.
Check the elements for uneven wear. Look for cool or dark spots and coils that lean or have uneven spacing. These can indicate wear, but firing unevenly by itself doesn’t confirm element failure because loading and power supply can also affect results.
Measure resistance using the kiln’s specified method. With power disconnected, use an ohmmeter and compare each reading with the manufacturer’s chart for your kiln model. Replacement limits vary by manufacturer and method: Skutt’s service manual flags readings more than 5% above its recommended resistance, while L&L guidance uses a 10% increase or, in one slow-firing guide, more than 9% above calculated resistance.
Check the circuit before blaming a dark section. If an entire kiln section is dark or reads 0 amps, inspect its relay or switch and wiring before replacing elements. Significantly low amperage points toward a broken element, while slightly low amperage can indicate worn elements or low voltage.
Use a glow check only as a visual check. During firing, view the elements through peepholes while wearing protective glasses; a broken element may not glow, and worn spots may appear cool or dark. Don’t touch elements during firing, and have a licensed electrical contractor perform tests that expose live components.
Decide whether the failure is isolated. Replace one element when the problem is limited to that element and the others remain in good condition; consider a full set when elements are near the end of their wear cycle or visibly deteriorated.
Kiln Element Symptoms and Next Checks
Replace kiln elements when a broken element or a model-specific resistance check confirms failure; a dark element needs further diagnosis. When deciding when to replace kiln elements, treat slow firing and uneven results as clues to investigate, not proof by themselves.
| Symptom or test result | Next diagnostic action |
|---|---|
| Firing takes longer or the kiln misses its target | Check element condition and resistance; also investigate relays, contacts, and supply voltage |
| Error 1/E1 code | Diagnose the cause of slow firing; the code alone doesn’t confirm element failure |
| Broken element or one element stays dark | Check for contamination or a poor electrical connection; inspect the element |
| Entire kiln section stays dark | Check the section’s relay or switch before condemning its element |
| Cool or dark spots on a glowing element | Inspect for wear; don’t use uneven firing results alone as a diagnosis |
| Zero ohms on an element resistance check | Interpret the reading using the kiln’s model-specific wiring instructions; Skutt guidance treats zero as a break |
| Resistance exceeds the kiln’s manufacturer limit | Compare the reading with factory values for the exact model and wiring, then apply that manufacturer’s replacement threshold |
A resistance result is useful only when you account for the kiln’s wiring and the correct factory value; replacement thresholds differ by manufacturer and method.
Frequently Asked Questions
Can one kiln element be replaced, or should all of them be replaced together?
Yes, you can replace one element when the failure is isolated and the other elements remain in good condition. Consider a full set if the elements are near the end of their wear cycle or visibly deteriorated, and check your kiln’s instructions because some models require all elements to be replaced together.
Can a kiln element look intact and still be failing?
Yes, an element can look intact and still be worn; compare its resistance with the factory value for your exact kiln model. Cool or dark spots on a glowing element can also indicate wear, though appearance alone doesn’t confirm failure.
Can I fire a kiln with one damaged or broken element?
No, don’t continue firing with a broken element until you’ve diagnosed the fault and followed the kiln maker’s guidance. A broken element can stop a series-wired kiln from heating properly, leading to inadequate or uneven firing.
Do kiln elements need to be replaced in a particular order?
Replace elements according to the position and type specified for your kiln model, since elements can differ within one kiln. Some models also require all elements to be replaced at once, so check the manufacturer’s instructions before starting.
What should I check after installing replacement kiln elements?
After installation, compare resistance with the factory values, reconnect the grounding wires, restore the control box, and verify that every element heats. Follow the manufacturer’s first-firing instructions; L&L recommends an initial firing program to confirm operation and form the elements’ protective oxide layer.
Conclusion
If a broken element or a resistance reading beyond your kiln’s model-specific limit confirms failure, replace the affected element; replace the full set only if the others are also near the end of their wear cycle or visibly deteriorated. If you’ve only noticed slow firing, dark sections, or uneven results, disconnect power, let the kiln cool, and check the elements, connections, and circuit before ordering parts. When the diagnosis or electrical test is unclear, follow the manufacturer’s service guidance or call a qualified technician.
Sources
- skutt.com (skutt.com)
- Element Troubleshooting | Hot Kilns (hotkilns.com)
- skutt.com (skutt.com)
- hotkilns.com (hotkilns.com)
- skutt.com (skutt.com)
- hotkilns.com (hotkilns.com)
- corp.paragonweb.com (corp.paragonweb.com)
- hotkilns.com (hotkilns.com)
- hotkilns.com (hotkilns.com)
- hotkilns.com (hotkilns.com)
- skutt.com (skutt.com)
- corp.paragonweb.com (corp.paragonweb.com)
- skutt.com (skutt.com)
