Rivacold HT Error Code
High temperature warning on Carel-controlled units — probe reading above the alarm threshold parameter
Source: Carel 2/technical_flat/030220416.pdf
What does Rivacold HT mean?
On the Carel µC SE process-chiller controller, Ht / HT is the high temperature warning: it is signalled when the temperature read by probe B1 exceeds the high-temperature alarm threshold set in parameter P16, with a delay so brief excursions don't trip it. The alarm table lists it as a temperature warning with automatic reset.
Symptoms
- Display shows Ht / HT
- The monitored temperature reads above the configured threshold
- Warning output/signalling active; cooling performance noticeably down
Common causes
- Heat load above the unit's capacity
- Condenser fouling, failed fan, or restricted airflow reducing capacity
- Refrigerant-side fault (undercharge, restriction) preventing the unit from holding temperature
- Threshold parameter (P16) set too close to the normal operating temperature
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Diagnostic steps
Read the actual temperature
Check the value the controller's probe reports against an independent measurement. If the reading is false, suspect the probe; if real, work the capacity cause.
Check the threshold parameter
Confirm the high-temperature alarm threshold (parameter P16 on Carel µC SE) is set sensibly for the application before chasing a fault.
Check capacity basics
Clean the condenser, confirm fans run, and verify the load on the unit hasn't increased beyond what it is sized for.
When to call a professional
If the threshold is sane, the probe reads true, and the condenser side is clean but the unit still cannot hold temperature, the refrigeration circuit needs diagnosis by a certified technician.
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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
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
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