Is that 1hr of BUH use? As in the below? (Just double checking the photo)
Daikin controller → Information → Running Hours → BUH
I would honestly disable its use (log in as “user profile” installer with code: 5678)
Then go to:
Daikin Controller —> Installer settings —> Backup Heater —> Operation —> “Restricted”
Then go back to main menu and “User Profile” —> “Advanced User (code: 1234)