Grant Aerona P14 fault code

What it means

Refrigerant leakage detected

The unit's R290 leak sensor has triggered. Treat as a live flammable-gas event until proven otherwise.

Safety: R290 / A3: eliminate ignition sources, ventilate the area, and approach with an R290-rated detector before any other work.

UK models this code applies to

From the Grant service literature we hold (Grant Aerona 290 installation manual DOC0204 Rev 1.8, Table 11-1) — not a scraped list.

Now the harder half: proving what caused it

P14 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 Grant Aerona's own chart for it, one question at a time.