What does Randell E0 mean?

On a Randell prep table fitted with the Carel controller, E0 is the control-probe alarm.

What does Randell E1 mean?

On a Randell prep table with the Carel controller, E1 is the defrost-probe alarm. The defrost probe is the sensor that monitors the evaporator coil to manage the defrost cycle.

What does Randell dOr mean?

On a Randell prep table with the Carel controller, dOr is the open-door alarm. It indicates the controller has detected a door or drawer left open, or a door switch reporting open, long enough to trigger the alarm. An open door lets warm air into the cabinet and can drive the temperature up if it is not closed.

Does AskWhiz cover Randell equipment?

Yes. AskWhiz is trained on official Randell service and operator documentation, so it can answer fault-code, error-message, and repair questions for Randell refrigeration units directly in WhatsApp.

How do I troubleshoot Randell error codes?

Send AskWhiz your Randell model number and the error code or symptom on WhatsApp. It searches the official Randell manuals and returns the likely cause and the documented fix, step by step, so you stop scrolling through PDFs in the field.

Is AskWhiz a substitute for the Randell service manual?

No. AskWhiz reads the official Randell documentation and surfaces the relevant procedure fast, but always follow the manufacturer safety warnings and call a qualified Randell technician for work that requires one.

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By Nichita Herput

Co-founder & CEO · Reviewed May 2026

What error codes does Randell display?

Control probe alarm on the Carel controller (air/control temperature sensor)

Defrost probe alarm on the Carel controller (evaporator/defrost temperature sensor)

dOr

Open door alarm on the Carel controller

Low temperature alarm (Carel LO / Danfoss Lo)

High temperature alarm (Carel HI / Danfoss Hi)

CHt

Dirty condenser alarm on the Carel controller

CON

Condenser Temperature High Limit alarm on the Danfoss controller

uHi

Line Voltage Too High alarm on the Danfoss controller

uLi

Line Voltage Too Low alarm on the Danfoss controller

LEA

Continuous Compressor Runtime alarm on the Danfoss controller

E01

S1 Sensor Failure on the Danfoss controller

E02

S2 Sensor Failure on the Danfoss controller

Common questions about Randell equipment

What other refrigeration brands does AskWhiz cover?

AskWhiz also covers troubleshooting for these manufacturers in the same industry:

3M Accurex AHT Cooling Systems AKO Alco Controls Alfa Laval Arneg Aspera BAC Bitzer Bock Carel

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