Display shows E5; water temperature is unstable or unit shuts down intermittently

Safety first: Disconnect power and close water supply before removing covers.

Steps:

• 1. Verify both NTC sensors: Locate inlet and outlet NTC sensors. Ensure both are firmly attached to their respective pipes or wells with proper clips or clamps.
• 2. Check for thermal paste: Some models require thermal compound between sensor and metal surface. If dried or missing, clean and reapply as specified.
• 3. Compare resistance: At room temperature, disconnect both sensors and measure resistance. Values should be similar (within manufacturer tolerance). Large differences indicate a faulty sensor.
• 4. Confirm correct parts: If a sensor was recently replaced, verify that the correct Electrolux part number was used. Mismatched NTC curves can cause E5.
• 5. Inspect wiring and connectors: Look for corrosion or loose pins at the PCB. Reseat connectors.
• 6. Test operation: Restore power and run hot water. If E5 persists with known-good sensors, the PCB may be defective.

Recommendation: Sensor curve verification and PCB replacement are best handled by an authorized technician if basic checks do not resolve the issue.