Code decoder
Randell error codes
Pick the maker and the equipment, or type the code. Each page says what the code means on that control, what is safe to check and when to stop.
- Codes
- 2,442
- Makers with codes
- 98
- Updated
- November 2026
CHtRandell Prep Table Error Code CHt: Dirty Condenser AlarmCONRandell Prep Table Error Code CON: High Condenser TemperatureDOrRandell Prep Table Error Code dOr: Open Door AlarmE0Randell Prep Table Error Code E0: Control Probe AlarmE01Randell Prep Table Error Code E01: S1 Sensor FailureE02Randell Prep Table Error Code E02: S2 Sensor FailureE03Randell Prep Table Error Code E03: S3 Sensor FailureE04Randell Prep Table Error Code E04: S4 Sensor FailureE1Randell Prep Table Error Code E1: Defrost Probe AlarmHI (Carel) / Hi (Danfoss)Randell Prep Table Error Code HI / Hi: High Temperature AlarmLEARandell Prep Table Error Code LEA: Compressor Running Too LongLO (Carel) / Lo (Danfoss)Randell Prep Table Error Code LO / Lo: Low Temperature AlarmUHiRandell Prep Table Error Code uHi: Line Voltage Too HighULiRandell Prep Table Error Code uLi: Line Voltage Too Low
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Code not listed, or no code at all?
A unit that shows nothing often points to power or the control. Call us with the maker and model number and we talk it through.