Control buttons (bottom row)
stop / reset (red): manually stops the running generator or clears latched fault alarms.
manual mode: switches controller to manual mode so you can start/stop the unit using front buttons.
mains / test mode: manual transfer / test operation.
auto mode: places the controller in fully automatic mode (monitors mains and auto-starts on power outage).
alarm mute: silences the internal audible buzzer during an active alarm.
start (green): manually starts the generator (when in manual mode).