Eliwell E3 Error Code

What does Eliwell E3 mean?

E3 signals a fault on probe Pb3, typically the display or air temperature probe depending on controller configuration. When E3 is active, defrost cycle termination by temperature is lost; defrost ends by time-out instead. The alarm remains active until the probe fault is resolved or Pb3 is excluded in parameters.

Symptoms

• Display shows 'E3' continuously or alternating with the room temperature.
• Alarm icon LED stays on.
• Defrost cycles terminate by time-out rather than by probe temperature threshold.
• Controller may continue normal refrigeration regulation using Pb1 if Pb1 is healthy.

Common causes

• Pb3 wiring is open-circuit (broken wire, loose terminal, or damaged connector).
• Pb3 probe is short-circuited.
• Probe type selection mismatched — H00 set to wrong NTC/PTC value.
• Pb3 probe configured as present in parameters but physically not installed.
• Temperature reading outside –50 °C to +110 °C operating range.

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Diagnostic steps

1. Inspect Pb3 wiring and connector

   Power down and check Pb3 terminals for loose connections, corroded pins, or damaged cable sheathing. Re-seat and tighten all connections.

2. Verify probe type and presence settings

   In the programming menu, confirm that the probe type parameter matches the fitted probe and that the 'Pb3 present' parameter is set to 'yes' only if the probe is physically installed.

3. Measure probe resistance at room temperature

   Disconnect Pb3 and measure resistance; a functioning NTC probe reads approximately 10 kΩ at 25 °C. Open-circuit or short-circuit reading indicates a failed probe.

4. Exclude Pb3 if not required

   If Pb3 is not used in the installation, set the 'Pb3 present' parameter to 'no' to suppress the alarm without affecting refrigeration regulation.

5. Replace Pb3 probe if faulty

   Fit a new probe of the correct type, routing extension cable away from power conductors to maintain EMC compliance.

When to call a professional

If E3 persists after probe replacement and parameter correction, or if defrost termination anomalies are causing excess ice build-up or product temperature excursions, a licensed refrigeration engineer should audit the full defrost configuration, check the controller firmware version, and inspect the control board input circuitry.