FNM HPE Series Owner's Manual page 59

Once finished the command acquisition procedure, the station is enabled to command the boat!
2.5.2.2 Engine Warm-up
If both levers are in neutral, by pressing for 3 seconds the Warm/Sync button of station which has the
command you enter in Warm-up mode. In Warm-up mode the Warm/Sync LED is blinking and it is
possible to accelerate the engine with clutch disengaged.
After positioning again both levers in neutral and pressing the Warm/Sync button for other 3 seconds
the function is disabled and the Warm/Sync LED stops flashing.
2.5.2.3 Synchro mode operation
This function is available only for twin-engine systems.
This function allows to command both engines at the same speed and direction with only one lever.
With both levers in neutral position, press the Engine buttons at the same time for 3 seconds. The
command of both engines is now on the right lever. In Synchro mode operation the Warm/Sync and
Command LEDs are always lighted on, except for the neutral position where all the LEDS are
permanently ON.
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FNM HPE Series 55