E4
Ambiano
Lid Temperature Sensor Fault / Overtemperature at Lid
E4 error appears when trying to start a pressure-cooking program; unit may not build pressure.
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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
Failed lid NTC sensor, Broken lid sensor wiring through hinge, Loose connector on lid sensor harness, Steam leakage causing localized overheating at lid sensor
How to Fix / Troubleshooting
Safety: Ensure the cooker is unplugged and fully depressurized before working on the lid.
- Inspect lid seal and steam path: Remove the silicone sealing ring and clean the lid thoroughly, including the steam release valve and float valve. Blocked steam paths can cause abnormal temperature readings.
- Check lid sensor wiring: On models with a wired lid sensor, open the top cover (if accessible) or hinge area and inspect the small harness leading to the lid NTC. Look for pinched, cut, or broken wires.
- Connector check: Trace the lid sensor harness to the main control board and re-seat the connector. Ensure it is fully latched.
- Sensor replacement: If the wiring is intact but E4 persists, the lid NTC sensor may be defective. Replace the lid temperature sensor assembly specific to your Ambiano model.
- Reassemble and test: Refit the sealing ring, ensure the lid closes smoothly, then test with water only on a short pressure program.
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Repair Difficulty
Medium
3/5
Required Part
Lid NTC Temperature Sensor Assembly
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