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The E04 error on your Hoover Oven means there is a problem with the oven temperature sensor (also called the NTC probe). The sensor is either faulty, damaged, or has a poor connection preventing the oven from accurately reading the internal temperature.
| Error code | E04 |
|---|---|
| Meaning | Temperature sensor (NTC probe) fault |
| Severity | High — Oven will not heat or operate correctly until resolved |
| Time to fix | 15–45 minutes |
| Tools needed | Screwdriver, multimeter (optional), replacement NTC sensor (if faulty) |
What the E04 error means
The E04 error code indicates a malfunction with the oven's temperature sensor, known as the NTC (Negative Temperature Coefficient) probe. This sensor monitors the internal oven temperature and sends readings to the control board so the oven can maintain the correct heat level. When the sensor fails, becomes disconnected, or sends incorrect readings, the control board cannot regulate temperature safely and displays the E04 error to prevent damage or unsafe operation.
Common causes
- Faulty or damaged NTC temperature sensor probe
- Loose or disconnected wiring between the sensor and control board
- Corroded or burnt sensor connector terminals
- Short circuit in the sensor wiring harness
- Failed control board (less common, but possible if sensor tests correctly)
- Physical damage to the sensor from cleaning or excessive heat exposure
How to fix the E04 error
- Turn off power to the oven — Switch off the circuit breaker or unplug the oven completely from the mains. Wait 5 minutes to allow residual power to dissipate. This is essential for your safety before accessing internal components.
- Access the temperature sensor — Remove the oven racks and locate the temperature sensor probe, which is typically mounted on the rear interior wall of the oven cavity or behind a metal panel. You may need to remove screws or panels to access the sensor and wiring connections.
- Check the sensor connections — Inspect the wiring connector at the back of the sensor. Ensure it is firmly attached and look for signs of corrosion, burning, or damage. Disconnect and reconnect the connector to ensure a secure fit. Clean any corrosion with electrical contact cleaner if needed.
- Test the sensor with a multimeter — If you have a multimeter, disconnect the sensor and measure its resistance. At room temperature (around 20°C), the sensor should read approximately 1000–1200 ohms. If the reading is infinite (open circuit), zero, or significantly different, the sensor is faulty and needs replacement.
- Replace the faulty sensor — If the sensor is defective, order a genuine Hoover replacement NTC probe using your oven's model number. Disconnect the old sensor, remove any mounting brackets or screws, and install the new sensor in the same position. Reconnect the wiring securely.
- Restore power and test — Turn the power back on and set the oven to a moderate temperature to test. The E04 error should clear if the sensor is now functioning correctly. If the error persists after replacing the sensor, the control board may require professional inspection.
FAQ
Can I use my Hoover oven with the E04 error showing?
No, you should not use the oven when the E04 error is displayed. The oven cannot accurately monitor or control temperature without a functioning sensor, which creates a safety risk including potential overheating or underheating.
How much does a replacement NTC sensor cost for a Hoover oven?
A genuine Hoover NTC temperature sensor typically costs between £15 and £35, depending on your specific oven model. Always use the correct part number for your appliance to ensure compatibility and proper function.
Will resetting my Hoover oven clear the E04 error?
A power reset may temporarily clear the error from the display, but it will return if the underlying sensor fault remains. Turn off the oven at the circuit breaker for 5 minutes, then restore power. If E04 reappears during heating, the sensor or wiring requires repair or replacement.
