E4
Breville
Overheat or Thermal Fuse Open
Unit beeps and shows E4, will not start a cooking cycle.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Blown thermal fuse due to severe overheating, Blocked internal airflow around heater, Shorted heating element causing localized overheating, Failed cooling/exhaust fan
How to Fix / Troubleshooting
Safety first: Unplug the air fryer. A blown thermal fuse indicates a serious overheat event; inspect carefully before reusing.
- External checks: Confirm the unit was not used under cabinets or with vents blocked. Correct any installation issues to prevent repeat failures.
- Access thermal fuse: Remove the outer cover to locate the thermal fuse in series with the heating element wiring, often sleeved in fiberglass tubing near the heater.
- Test continuity: With a multimeter, check the thermal fuse. If it reads open (no continuity), it has blown and must be replaced with the exact temperature and current rating specified for Breville models.
- Inspect heating element and wiring: Look for signs of arcing, burnt insulation, or a warped heating element. Replace the heating element assembly if damaged.
- Check exhaust/cooling fan: Spin the exhaust fan motor by hand; it should turn freely. If seized or noisy, replace the fan motor. A failed fan can cause overheating and blow the fuse.
- Replace fuse and reassemble: Install the new thermal fuse using proper crimp connectors and heat-resistant sleeving. Do not bypass the fuse; it is a critical safety component.
If the new fuse blows again quickly, stop using the appliance and have it professionally inspected.
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Repair Difficulty
Professional Required
5/5
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