Dixell/Copeland E2

What does Dixell/Copeland E2 mean?

The E2 alarm on the Dixell IPR208D/IPR215D iProRACK controller indicates a temperature probe fault or running fault on a configured sensor input. The controller detects that the probe signal is out of range or absent, and activates a warning — altering regulation behavior depending on how the fault probe is configured in the system.

Symptoms

• E2 displayed on the controller screen with warning indication.
• Temperature reading from the affected probe shows an out-of-range value.
• Normal running and regulation may continue with a fallback value or be suspended.
• General alarm icon illuminated on the display.

Common causes

• Probe sensor wire broken or disconnected at the terminal.
• NTC or PT1000 sensor failed — open or short circuit.
• Moisture or corrosion on probe connector terminals.
• Probe wiring routed too close to power cables causing interference.
• Probe type configured in software does not match the installed sensor.

Diagnostic steps

1. 01

   Identify the faulty probe

   Navigate the IPR208D/IPR215D display to the alarm detail screen to determine which specific probe channel is generating the E2 alarm.

2. 02

   Inspect probe wiring and connections

   Check the probe wiring at the terminal block and at the probe head for loose connections, broken conductors, or corrosion. Re-seat connectors and inspect for pinched or chafed wires.

3. 03

   Measure probe resistance

   Disconnect the probe from the terminal and measure resistance with a multimeter at the probe body. Compare against the NTC or PT1000 characteristic curve for the measured temperature — a reading of 0 Ω or OL indicates a short or open failure.

4. 04

   Verify probe type configuration

   Access the controller parameters and confirm the probe type setting matches the installed sensor (NTC, PT1000, or transducer). A mismatch will cause a permanent fault reading even with a good sensor.

5. 05

   Replace the probe if faulty

   If the probe fails resistance testing, replace it with an identical type and re-run the alarm reset from the function menu. The alarm clears automatically once a valid signal is detected.

When to call a professional

Call a licensed refrigeration technician if the E2 alarm persists after probe replacement and the temperature reading remains invalid, if the fault involves a discharge or suction temperature sensor critical to compressor protection, or if parameter reconfiguration of the iProRACK controller is required beyond basic probe type selection.