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Reduced Ventilation

Reduced Ventilation Capacity — Inefficient operation or potential moisture damage

NIBE · F750 Heat Pump

What does Reduced Ventilation mean?

The heat pump's ventilation system is not moving enough air, which can lead to inefficient heating/cooling and might cause moisture problems in the house.

Common Causes

  • Blocked ventilation openings
  • Tight bends or creases in ducts
  • Incorrectly positioned or adjusted exhaust air devices
  • Incorrect ventilation capacity setting in the heat pump menu

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check that all ventilation openings in the house are not blocked.

  2. 2

    Inspect exhaust air ducts for any reductions in cross-sectional area like creases or tight bends.

  3. 3

    Ensure exhaust air devices are correctly positioned and adjusted according to installation guidelines.

  4. 4

    Set the ventilation capacity in the heat pump's menu system (Menu 5.1.5).

Browse all codes in this manual (18)
Verified technical data. Last updated: April 2026

Related Faults

Additional heat blocked symbolAdditional heat blocked symbol displayed — Additional heat is not availableAlarm persists after resetRed status lamp and 'alarm' menu remain after reset — Problem not resolvedBoiler Dry Start DamageDamaged Components — Temperature limiter, thermostat, or immersion heater damaged
Source: NIBE F750 Heat Pump
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