Water heater does not heat; display shows E1 shortly after a heating request

Safety first: Turn OFF the water heater at the circuit breaker and close the cold water supply valve before working on the unit. Confirm no voltage is present with a multimeter.

Steps to check and correct:

• 1. Power-cycle the unit: Turn the breaker OFF for 5 minutes, then ON again. If E1 reappears, continue.
• 2. Inspect the inlet temperature sensor (NTC): Remove the front cover. Locate the inlet thermistor on the cold water inlet pipe or heat exchanger inlet (often clipped or screwed into a small well). Check for corrosion, broken leads, or water intrusion.
• 3. Test the sensor with a multimeter: Disconnect the NTC from the harness. Measure resistance at room temperature and compare to Electrolux specifications (typically 5–20 kΩ at 25°C; consult service manual). If reading is infinite (open) or near 0 Ω (short), the sensor is defective.
• 4. Inspect wiring harness: Trace the two sensor wires back to the main PCB. Look for pinched, burned, or loose connectors. Reseat the connector on the PCB and sensor.
• 5. Replace the inlet NTC sensor if faulty: Remove the retaining clip or screw, pull out the sensor, install the new one with a small amount of thermal compound if specified, and secure it firmly.
• 6. If sensor and wiring test good: The temperature input circuit on the main control board may be defective. Replacement of the PCB is typically required and is best done by a qualified technician.

When to call a professional: If you are not comfortable testing resistance or accessing the PCB, or if replacing the sensor does not clear E1, contact an authorized Electrolux service center.