Recording a filter change on the unit

“Record a filter change” writes the date into the recuperator itself, so the **unit's own** countdown starts again — this is not the app keeping a private note. Pick the day it actually happened: a change made last Saturday is recordable as last Saturday.

It always asks you to confirm, because it writes to your hardware and clears a maintenance counter — a mis-tap must not be able to do that. It also needs a direct local connection to the unit: over the cloud the app says so instead of pretending the write went through.