What does error code 'P1' mean on an Eliwell IC controller?

P1 on Eliwell IC series controllers indicates a probe 1 alarm — the main temperature probe has failed or is disconnected. Check the probe wiring at both the probe connector and the controller terminals. Measure NTC probe resistance: at 25°C it should read 10kΩ. A reading of 0Ω indicates a short; OL (open circuit) indicates a broken probe or wire.

How do I enter programming mode on an Eliwell EWRC controller?

To enter programming mode on the Eliwell EWRC series, press and hold SET for 5 seconds until 'Pr1' appears. Use UP/DOWN to scroll through parameters and SET to enter and confirm each parameter value. Exit programming mode by pressing SET repeatedly until the normal temperature display returns, or wait for the auto-exit timeout (typically 30-60 seconds of inactivity).

What is the correct procedure for replacing an Eliwell probe?

Power down the controller before replacing probes to prevent false alarms. Identify the probe type from the label (NTC 10kΩ at 25°C is most common for Eliwell). Route the new probe to the same location as the original — cabinet probe in the return air stream, defrost probe clamped to the evaporator coil. Re-enter programming mode after replacement and verify probe readings are stable.

How do I configure the Eliwell STD controller for medium temperature applications?

For medium temperature applications (+2 to +5°C), set the Eliwell STD controller as follows: SP (setpoint) = +3°C, Hy (differential/hysteresis) = 1°C, LS (minimum setpoint) = -5°C, US (maximum setpoint) = +10°C. For defrost, set dFt = 1 (electric), dtE = +8°C, and MdF = 30 minutes. Adjust alarm parameters (AH = 5°C, AL = -10°C) to suit the application.

What causes an Eliwell controller to show a flashing temperature display?

A flashing display on Eliwell controllers typically indicates an active alarm condition. The display alternates between the temperature reading and the alarm code. Check alarm history by pressing SET and DOWN simultaneously. Common causes of flashing display: probe fault (P1/P2), temperature alarm exceeded (AH/AL), or compressor protection timer active (unit recently powered on).

What does E1 mean on an Eliwell ID Plus, IDNext, or EWRC controller?

E1 on Eliwell ID Plus, IDNext, EWPC, EWCM and EWRC refrigeration controllers signals that probe Pb1 (the room / cabinet thermostat probe) has failed open-circuit, short-circuit, or out-of-range. While E1 is active the controller falls back to timed compressor regulation using the Ont and OFt duty-cycle parameters and disables the high / low temperature alarms. Verify the probe-type parameter H00 (0 = PTC, 1 = NTC), then disconnect Pb1 and measure resistance — a healthy NTC 10 kΩ probe reads ~10 kΩ at 25 °C and ~32 kΩ at 0 °C. Replace the probe if open or shorted.

What are the high-temperature (AH / HA1) and low-temperature (AL / AL1) alarms on Eliwell controllers?

AH / HA1 and AL / AL1 are temperature-band alarms referenced to probe Pb1. AH (legacy label) and HA1 (EWRC / RTX-600 label) trip when the cabinet rises above the high-limit threshold (HAL parameter); AL and AL1 trip when temperature falls below the low-limit threshold (LAL parameter). Both are auto-reset, are recorded in the alarm folder (ALr), and do not block refrigeration regulation. Common causes: dirty condenser, defective door seal, low refrigerant charge, alarm threshold set too tight to the setpoint, or a probe positioned in a cold spot near the evaporator. Investigate before silencing — sustained AH on a food-storage cabinet is a HACCP critical control point.

What does F1 mean on an Eliwell EWRC5000 controller?

F1 on the Eliwell EWRC5000 AIR controller is a motor-overload protection alarm triggered by the QM1 overload relay tripping in the panel. The controller reads the overload input from the motor protection circuit and may block regulation depending on configuration. Locate QM1 in the panel, wait 5–10 min for the motor to cool, then press the relay reset; do not reset repeatedly without investigating. Clamp-meter the motor running current against nameplate FLA, confirm the QM1 trip-current dial is set correctly for the motor, and check supply voltage for phase loss before returning the unit to service. Repeated trips indicate winding insulation failure or a mechanical lock-up.

What's the difference between Eliwell ID Plus, IDNext, EWPC, EWCM, and RTX-600 fault codes?

Eliwell sells controller families that share probe-fault codes but differ in scope. ID Plus, IDNext, EWPC and the legacy EWRC use E1–E2 for Pb1 / Pb2 probes plus AH / HA1 / AL / LA1 for temperature-band alarms — retail and walk-in refrigeration. EWCM cold-room controllers add E3 (Pb3 defrost / display probe) and E10 (RTC clock fault). EWCB compressor-rack controllers use the same probe scheme plus rack-specific alarms. The RTX-600 supervisory controller adds E4–E7 for the auxiliary probes Pb4–Pb7, AL1 / AL2 for per-probe low alarms, and E11–E15 for electronic-expansion-valve faults. Always confirm which controller family is installed before consulting a code table — the same E11 means a serial probe fault on ID Plus and an EEV closure-time fault on RTX-600.

How do I turn an Eliwell controller on or off without disconnecting power?

On Eliwell ID Plus, IDNext and EWPC controllers, press and hold the on / off button (often the upper-left key, sometimes labelled with a power icon) for 5 seconds. The controller enters stand-by, the display shows 'OFF', regulation is suspended, and outputs are de-energised — but the controller stays powered so HACCP logging and alarm circuits keep running. Press the same key again for 5 seconds to return to normal operation. If the on / off function is disabled in parameters (parameter onF = 0 on some families), enable it via the programming menu or use the dedicated stand-by digital input if wired. Stand-by mode is the correct way to take a unit out of service for cleaning — do not isolate panel power unless the maintenance procedure specifically requires a hard power-down.

Quick Answer

Eliwell refrigeration controllers (ID Plus, IDNext, EWPC, EWCM, EWCB, EWRC, RTX-600) use E-codes for probe faults — E1–E7 are Pb1–Pb7 NTC / PTC failures, E10 is an RTC clock fault, E11–E15 cover expansion-valve and serial-probe faults — AH / HA1 / AL / AL1 / AL2 for high and low temperature alarms, and F1 for motor-overload trips on EWRC5000.

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By Nichita Herput

Co-founder & CEO · Reviewed May 2026

What error codes does Eliwell display?

Probe Pb1 (room / cabinet) fault — controller falls back to Ont / OFt duty-cycle, replace NTC probe

Probe Pb2 (evaporator) fault — defrost terminates by time-out only, replace probe

Probe Pb4 fault on RTX-600 — check H00 probe-type parameter and Pb4 wiring

Probe Pb5 fault on RTX-600 — measure NTC resistance, replace probe if open / shorted

Probe Pb6 fault on RTX-600 — inspect connector, verify probe type, replace if faulty

Probe Pb7 fault on RTX-600 — controller loses Pb7-dependent regulation until cleared

High temperature alarm on Pb1 — inspect condenser, door seal and HAL threshold

Low temperature alarm on Pb1 — verify LAL threshold, probe placement and EEV operation

AL1

Low temperature alarm on Pb1 (RTX-600) — logged in ALr folder, no regulation effect

Motor-overload alarm via QM1 relay (EWRC5000) — cool motor, reset QM1, clamp-meter FLA

Common questions about Eliwell equipment

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