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Low system pressure

Low system pressure — Not enough water in the heating system

Nibe · Air Conditioning

What does Low system pressure mean?

The heating system pressure is too low, which can affect performance. The pressure gauge should normally be between 0.5 and 1.5 bar.

Common Causes

  • Leak in the heating system
  • Water has been released from the system

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check for visible leaks.

  2. 2

    Top up the heating system with water using the filler valves.

  3. 3

    If the pressure continues to drop, contact your installer.

Browse all codes in this manual (95)
Verified technical data. Last updated: April 2026

Related Faults

107Sensor flt: BT7 HW sens top 107 — Sensor fault: Hot water sensor151Sen flt: CL11- BT51 pool temp sensor 151 — Sensor fault: Pool temperature sensor152Sen flt: CL12- BT51 pool temper- ature sensor 152 — Sensor fault: Pool temperature sensor
Source: Nibe Air Conditioning
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