Eliwell E6 Error Code

What does Eliwell E6 mean?

E6 indicates a fault on probe Pb6 in the Eliwell RTX-600 series. Pb6 is one of the additional temperature inputs on the RTX-600 multi-probe platform. The controller has detected that Pb6 is open-circuit, short-circuited, or reading outside the valid operating range. The alarm icon illuminates permanently while E6 is active.

Symptoms

• Display shows 'E6' with the alarm icon permanently on.
• Pb6 temperature reading is absent from the controller display.
• Alarm recorded in the ALr alarm folder.
• Buzzer activates if configured.
• Functions dependent on Pb6 data default to fallback mode.

Common causes

• Pb6 wiring is open-circuit (broken conductor or loose terminal).
• Pb6 probe is short-circuited.
• Probe type parameter set incorrectly for the probe connected to the Pb6 input.
• Measured temperature outside the probe's valid range (–50 °C to +110 °C for NTC).
• Probe connector at terminal block corroded or dislodged.

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Diagnostic steps

1. Inspect Pb6 cable and terminal connections

   Power down the controller and check Pb6 wiring at the terminal block and probe head for loose screws, corrosion, and cable damage.

2. Verify probe type setting for Pb6

   Access the programming menu and confirm the probe type parameter for the Pb6 channel matches the physical probe. Correct if needed and power-cycle the controller.

3. Measure probe resistance

   Disconnect Pb6 leads and measure resistance with a multimeter. A serviceable NTC probe reads ~10 kΩ at 25 °C; open or shorted reading indicates failure.

4. Replace the Pb6 probe

   Fit a new probe of the correct type. NTC probes are non-polarised; route the cable away from power wiring to minimise EMI.

5. Confirm alarm resolution

   Power up and check that E6 is cleared and Pb6 displays a valid temperature.

When to call a professional

If E6 remains after probe replacement and parameter correction, the Pb6 input channel on the controller board is likely damaged. A refrigeration technician should perform continuity testing, verify the wiring harness, and replace the controller module if the input is confirmed faulty.