Grant Aerona E15 fault code

What it means

DC bus voltage too low

Safety: Safe isolation and capacitor discharge before touching the inverter boards.

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

E15 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.