Rivacold LO Error Code
Low-temperature alarm — cabinet/room temperature below the alarm threshold
Source: Carel/commercial/0300099EN.pdf
What does Rivacold LO mean?
On the Carel, Eliwell, or Dixell controller fitted to a Rivacold unit, LO is the low-temperature alarm. On the Carel controllers it is signalled by the buzzer and the code LO on the display when the temperature falls below the low-temperature alarm threshold (AL, relative to setpoint or absolute depending on A1) for longer than the alarm delay (Ad), and it resets automatically once the temperature rises back by the reset differential (A0). The box is colder than it should be — it is a warning signal.
Symptoms
- Display shows LO (or a flashing low-temperature alarm) with the buzzer/relay active
- Cabinet temperature sits below the setpoint band
- Alarm clears automatically once the temperature rises back above the threshold plus the differential
Common causes
- Setpoint or low-alarm threshold set incorrectly for the application
- Failed/stuck-closed liquid solenoid or a control relay welded so the compressor over-runs
- Cabinet/room probe out of calibration or reading low
- Product freezing because the alarm differential is set too tight
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Diagnostic steps
Check setpoint and threshold
Confirm the setpoint and the low-alarm threshold/differential are correct for the product — a misconfigured threshold is the most common LO cause.
Verify the probe reads true
Compare the controller's cabinet reading against a calibrated thermometer; a probe drifting low will trip LO with the box at the correct temperature.
Confirm the unit cycles off
Watch that the compressor and liquid solenoid actually stop on satisfy. A welded contactor or stuck solenoid that keeps cooling will drive the box below setpoint.
When to call a professional
If the controls de-energize correctly but the box still over-cools, or a contactor/solenoid is suspected welded, have a refrigeration technician check the control circuit and components.
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Other Rivacold Error Codes
High-temperature alarm — cabinet/room temperature above the alarm threshold
Temperature-probe fault — which probe E1 names depends on the fitted controller (probe 2/defrost on Carel easy; probe 1/S1 on other families)
Temperature-probe fault — which probe E2 names depends on the fitted controller (probe 3/condenser-product on Carel easy; probe 2/S2 on other families)
High discharge-pressure alarm — the controller stops the unit; manual or semi-automatic reset
Low suction/evaporation-pressure alarm — the unit stops when evaporation pressure falls below the threshold
Maximum temperature alarm on Dixell controllers — temperature above the high-alarm threshold (a temperature alarm, not a pressure trip)
Minimum temperature alarm on Dixell controllers — temperature below the low-alarm threshold
High temperature warning on Carel-controlled units — probe reading above the alarm threshold parameter
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