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Hot gas alarm 238

Alarm 238 (or 230, 78) Hot gas alarm — High discharge temperature in the refrigerant circuit

NIBE · S2125 Air/Water Heat Pump

What does Hot gas alarm 238 mean?

This alarm is triggered by 3 repeated instances of high discharge temperature within 4 hours, typically indicating a disruption or fault in the refrigerant circuit.

Common Causes

  • Disruption in the refrigerant circuit.
  • Lack of refrigerant.
  • Poor cooling or flow within the system.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

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

  2. 2

    Verify the air flow to S2125 is not blocked by foreign objects.

  3. 3

    Ensure the outdoor unit is clear of snow, ice, or debris that might impede air circulation.

  4. 4

    If the alarm persists, contact a qualified technician to inspect the refrigerant circuit and charge levels.

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