NIBE 236 fault code

What it means

Unsuccessful defrosting

Ten failed consecutive defrosts. NIBE's listed cause: system temperature and/or flow too low.

UK models this code applies to

From the NIBE service literature we hold (NIBE S2125 installer manual IHB EN 2442-3 731742 — Alarm list) — not a scraped list.

Now the harder half: proving what caused it

236 names a symptom, not a root cause. In the app, the same code opens a guided investigation: what to measure first, the expected values for your exact model, and an honest verdict — including “nothing in this machine is broken” when that's what the readings say.

Free, no sign-up. Pick the model and follow NIBE's own chart for it, one question at a time.