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LP ALARM (Low Pressure Alarm)

LP ALARM (Low Pressure Alarm) — Low pressure in the climate system

NIBE · F1245 Ground Source Heat Pump

What does LP ALARM (Low Pressure Alarm) mean?

The 'LP ALARM' indicates a low pressure condition within the climate system. This could affect the heat pump's ability to operate efficiently or provide heating.

Common Causes

  • Low water level in the climate system.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the water pressure in your climate system.

  2. 2

    Top up the water in the climate system to the recommended level.

  3. 3

    If the alarm persists after topping up the water, contact your installer.

Browse all codes in this manual (6)
Verified technical data. Last updated: April 2026

Related Faults

Compressor does not startCompressor does not start — No heating or hot water demand, or system lockoutHigh or distracting ventilationHigh or distracting ventilation — Unadjusted ventilation or forced fan speed (NIBE FLM accessory)Low or lack of ventilationLow or lack of ventilation — Reduced fan speed or blocked airflow (NIBE FLM accessory)
Source: NIBE F1245 Ground Source Heat Pump
Open Manual (Page 57)Search more codes in this manual