Boiler frequently goes into frost protection mode even when not particularly cold indoors

Safety first: Frost protection is a safety feature; do not disable it entirely.

• Check sensor locations: Ensure indoor and outdoor sensors are not exposed to drafts, direct sunlight, or other heat/cold sources.
• Review settings: In the Nibe control menu, check frost protection thresholds and adjust within recommended limits if you are competent.
• Seal drafts: Reduce cold drafts around sensors and pipework that may trigger unnecessary frost cycles.
• Technician calibration: A Nibe technician can verify sensor readings and replace faulty Nibe indoor or outdoor sensors.