Rivacold LP Error Code
Low suction/evaporation-pressure alarm — the unit stops when evaporation pressure falls below the threshold
Source: Carel/commercial/0300099EN.pdf
What does Rivacold LP mean?
On the Carel controllers fitted to Rivacold plug-in units, LP is the low evaporation pressure alarm: when the evaporation pressure falls below the configured threshold (LPt) for the set time, the controller stops the unit and shows LP on the display. The alarm delay is differentiated between steady operation (LPE) and compressor start-up (LPS) so start transients don't nuisance-trip it. Reset is selectable between manual and semi-automatic — semi-automatic clears once the pressure rises above LPt plus the differential (LPU), and after the maximum number of automatic resets (LPo) the alarm requires a manual reset.
Symptoms
- Display shows LP and the unit is stopped
- Suction pressure on gauges reads below the trip threshold
- Trips cluster at compressor start-up, or after the unit has been running iced-up or starved
- Poor or no cooling before the trip
Common causes
- Refrigerant undercharge from a leak
- Iced or airflow-starved evaporator (failed fan, blocked coil, defrost problem)
- Blocked filter-drier or restricted/failed expansion device
- Liquid-line solenoid not opening
- Low ambient at the condensing section pulling suction pressure down
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Diagnostic steps
Look at the evaporator first
An iced coil or a dead evaporator fan starves the suction side. Check airflow, ice, and that defrost is working before touching the refrigerant circuit.
Gauge the suction side
Confirm the actual suction pressure against the threshold. Note whether the trip happens at start-up (transient, delay may be set too tight) or in steady running (real starvation).
Check for restrictions
Feel for a temperature drop across the filter-drier and verify the liquid solenoid opens — a restriction or a closed solenoid starves the evaporator and pulls suction down.
Leak-check if undercharged
Low charge is the most common steady-state LP cause; find and fix the leak rather than topping up.
When to call a professional
Charge verification, leak search and repair, and expansion-device or drier replacement are sealed-system work for a certified refrigeration technician. If LP trips persist after airflow and defrost check out, the refrigerant circuit needs professional diagnosis.
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Other Rivacold Error Codes
High-temperature alarm — cabinet/room temperature above the alarm threshold
Low-temperature alarm — cabinet/room temperature below 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
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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