Nibe 182 Fault Code: Causes, Fixes & Repair Costs
What does the Nibe 182 fault code mean?
Alarm 182 on a NIBE heat pump means the load monitor has activated: the unit's current-monitoring (via clamp-on current sensors on your incoming supply) has measured the household's electrical draw approaching the main fuse's limit, and has stepped back its own consumption — blocking one or more immersion/addition power steps — to keep the whole house within its fuse rating. This is a feature doing its job rather than a failure: the load monitor exists so the heat pump's addition heater never trips your main fuse while the oven, shower and car charger run. Frequent activation, though, is information — either the addition is doing too much work, the fuse size setting is wrong, or the house genuinely runs near its supply limit.
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
- High simultaneous household load Common
Electric shower, oven, kettle and EV charger together push the supply near the main fuse rating — the load monitor sheds heat pump addition until the peak passes. Normal behaviour.
- Addition (immersion) running more than it should Sometimes
If the compressor is underperforming and the electric addition covers the shortfall, total draw rises and the monitor trips often — the alarm then hints at a different problem worth finding.
- Wrong fuse-size setting or current sensor issue Sometimes
A fuse rating configured too low, or a current transformer misreading, makes the monitor intervene unnecessarily — a settings/diagnosis fix.
How to fix it
- Note when it happens DIY safe
If activations coincide with showers, cooking or car charging, the monitor is simply managing peaks — no action needed beyond perhaps staggering big loads. Constant activation with no obvious peak is the version worth reporting.
- Have a suitably qualified heat pump engineer complete the documented checks heat pump engineer
For frequent activation, the engineer will check the configured fuse size against your actual main fuse, verify the current sensors, and — importantly — check why the electric addition is working hard enough to matter, which can reveal a compressor or sizing issue. 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
- Current sensor (CT clamp) set · from £40
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–£250, depending on the underlying cause.
Frequently asked questions
What does alarm 182 mean on my NIBE?
The load monitor measured your house's total electrical draw nearing the main fuse's limit and temporarily reduced the heat pump's electric addition to compensate. It is protective and usually benign — managing peaks so your main fuse never trips. Frequent activation is worth investigating.
Does it mean my heating turns off?
Not the heat pump itself — the compressor keeps running; it is the supplementary electric heating (addition steps) that gets blocked during the peak. You would rarely notice unless the weather is extreme.
It activates constantly — should I worry?
Constant activation means either the settings overstate your fuse limitation, the current clamps misread, or the electric addition is carrying load the compressor should — the last being the interesting one, as it can flag an underperforming heat pump. An engineer visit sorts all three.