Dixell/Copeland E1

What does Dixell/Copeland E1 mean?

The E1 alarm on the Dixell IC100CX EVO iChill controller indicates an I/O expansion probe alarm. The controller has detected a fault on one or more probe channels connected via the I/O expansion module — such as APE1 through APE8. The affected probe is reading outside its valid signal range, indicating an open circuit, short circuit, or disconnected sensor on the expansion hardware.

Symptoms

• E1 displayed on the IC100CX EVO controller screen.
• Alarm icon illuminated on the display.
• Affected I/O expansion probe channel shows an out-of-range temperature or signal value.
• Functions relying on the faulty expansion probe may be suspended or run in fallback mode.

Common causes

• Probe connected to the I/O expansion module has failed — open or short circuit.
• Wiring between the expansion module and the probe is broken or disconnected.
• I/O expansion module communication fault preventing probe data from reaching the controller.
• Probe type configured in the expansion module does not match the installed sensor.

Diagnostic steps

1. 01

   Identify the faulty expansion probe

   Navigate the IC100CX EVO display to the alarm detail or expansion probe status screen. Identify which expansion probe channel (APE1–APE8) is generating the fault.

2. 02

   Inspect the I/O expansion module connection

   Check the communication wiring between the IC100CX EVO and its I/O expansion module. Verify the connector is seated and the bus wiring is intact and not reversed.

3. 03

   Check probe wiring at the expansion module

   Inspect the probe wiring terminals on the I/O expansion module for the faulty channel. Look for loose connections, broken conductors, or corroded terminals.

4. 04

   Measure probe resistance

   Disconnect the probe from the expansion module terminal and measure resistance with a multimeter at the probe body. Compare against the NTC or PT1000 characteristic — 0 Ω or OL indicates failure.

5. 05

   Replace probe or verify expansion module

   Replace the faulty probe with an identical type. If the alarm persists after probe replacement, the I/O expansion module itself may have failed — test with a known-good module.

When to call a professional

Call a Dixell-authorized service technician if the E1 alarm implicates the I/O expansion module hardware rather than the probe itself, if replacing the expansion module requires re-commissioning its configuration, or if the affected probe is critical to a safety function such as evaporator freeze protection.