Nibe 180 Fault Code: Causes, Fixes & Repair Costs
What does the Nibe 180 fault code mean?
Alarm 180 on a NIBE heat pump signals freeze protection: the controller has detected conditions where parts of the system risk freezing — the documented trigger being outdoor temperature below about 3°C while heating is not permitted to run — and has raised the alarm so the situation is not left unattended. It differs in character from most alarms: rather than a component failing, it flags a configuration or circumstance (heating blocked by settings, tariff blocks, or another fault) coinciding with freezing weather, when water in the outdoor pipework or heat exchangers could freeze and split. The response is to find out why heating is blocked in weather that plainly requires it.
General guidance only — not a substitute for professional advice, and not certified by an heat pump engineer. Always have your specific appliance assessed by a qualified professional. Any heat pump work must be carried out by an MCS-certified heat pump engineer. If you notice a refrigerant leak, a burning smell or water leaking from the unit, switch it off at the isolator and call an MCS-certified heat pump engineer. Refrigerant work must be carried out by an F-Gas registered engineer.
Common causes
- Heating blocked by settings or schedule in freezing weather Common
Holiday modes, tariff/smart-grid blocks, or 'heating off' seasonal settings left active into a cold snap are the classic trigger — the protection notices the contradiction.
- Another fault preventing heating Common
A separate alarm blocking the compressor and addition leaves the system unable to protect itself; alarm 180 then rides on top of the underlying fault.
- Sensor error making the unit think heating is unavailable Sometimes
A faulty outdoor or flow sensor can produce the blocked-plus-freezing combination artificially.
How to fix it
- Check for other active alarms and blocking settings DIY safe
Look at the display for any other alarm (fix that first) and review obvious blocks: holiday mode, schedules with heating off, or 'auto' seasonal settings that have not switched to winter. Re-enable heating if a setting was the cause.
- Acknowledge the alarm once and observe DIY safe
On the display, select the alarm and choose to reset/acknowledge it (or use 'aux. operation' if offered, which keeps some heating running). One reset is legitimate; if the alarm returns, leave it for an engineer rather than resetting repeatedly.
- Have a suitably qualified heat pump engineer complete the documented checks heat pump engineer
If heating is blocked by a fault rather than a setting, the engineer resolves the underlying alarm — freeze protection is the messenger. On systems with exposed outdoor pipework, they should also confirm the antifreeze/glycol protection or trace heating is adequate. Any work on the sealed refrigerant circuit legally requires an F-Gas registered engineer; a NIBE-accredited (NIBE Pro) installer is the natural choice.
Parts you may need
- Depends on the underlying block 0
The exact spare depends on your boiler's GC number (on the data badge). Check this against the part before buying.
Typical repair cost
Expect to pay roughly £0–£300, depending on the underlying cause.
Frequently asked questions
What does alarm 180 mean on my NIBE?
Freeze protection: it is below about 3°C outside and heating is not permitted to run — a combination that risks frozen pipework. Usually a setting (holiday mode, schedule, seasonal 'off') or another fault is blocking heating; find and fix that, and the protection stands down.
Is my heat pump broken?
Often not — alarm 180 is frequently a configuration alarm: the unit pointing out that its settings forbid heating in weather that demands it. Check for holiday modes and other active alarms before assuming hardware.
What could actually freeze?
Water in outdoor pipe runs and heat exchangers. A split heat exchanger is one of the priciest heat pump failures, which is why the unit refuses to let freezing weather plus blocked heating pass silently. Treat the alarm as prevention working.