Kaisai EC fault code

What it means

Refrigerant leakage detection

The unit's leak-detection logic has inferred a loss of charge. Confirm a real leak against a false reading before condemning anything.

Safety: R32 is A2L mildly flammable — leak-check with suitable equipment and ventilate.

UK models this code applies to

From the Kaisai service literature we hold (KAISAI FLY Inverter Series B (KWX) R32 service manual, §4 Quick Maintenance by Error Code (p.65, render-verified) + §5 Troubleshooting by Error Code) — not a scraped list.

Now the harder half: proving what caused it

EC 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.