Fujitsu General 22 fault code

What it means

Indoor unit capacity error

The indoor unit's set capacity doesn't match what the system expects — typically after a PCB swap where the capacity wasn't set, or a wrong replacement board.

UK models this code applies to

From the Fujitsu General service literature we hold (Fujitsu General ASEH07/09/12/14KMCG service manual (official UK webstore), error-code table + troubleshooting; cross-checked against SR_AS092EF_01. All 23 codes verified model-specific 2026-07-16.) — not a scraped list.

Now the harder half: proving what caused it

22 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.