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).

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Common Eliwell Error Codes

Probe 1 (main) fault — check NTC sensor and wiring

Probe 2 (defrost) fault — check evaporator probe

High temperature alarm — temperature exceeded maximum threshold

Low temperature alarm — temperature below minimum threshold

Frequently Asked Questions — Eliwell

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