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Low evaporation temp 240

Alarm 240 (or 232, 76) Low evaporation temp — Low evaporation temperature in the refrigerant circuit

NIBE · S2125 Air/Water Heat Pump

What does Low evaporation temp 240 mean?

This alarm occurs after 5 repeated instances of low evaporation temperature within 4 hours, suggesting a lack of refrigerant or a blockage.

Common Causes

  • Lack of refrigerant.
  • Blocked expansion valve.
  • Significant wind effect on the outdoor unit.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the indoor module/control module display for specific action instructions.

  2. 2

    Inspect the outdoor unit for any obstructions like leaves, snow, or ice that might affect airflow or heat exchange.

  3. 3

    Ensure the system is not exposed to extreme wind conditions.

  4. 4

    If the alarm persists, contact a qualified technician to check refrigerant levels and the expansion valve.

Browse all codes in this manual (55)
Verified technical data. Last updated: April 2026

Related Faults

Communication fault to Inverter 254Alarm 254 (or 264, 203) Communication fault to Inverter — Inverter unpowered or brokenCompressor speed too low 354Alarm 354 (or 503, 186) Compressor speed too low — Inverter safety function reduces compressor speedContinuous light CPULED: CPU Continuous light — CPU is not running correctly
Source: NIBE S2125 Air/Water Heat Pump
Open Manual (Page 42)Search more codes in this manual