Summary
Most Fujitsu highwall indoor units include a manual/auto button on the fascia. It lets you (a) start/stop the unit, (b) run an Auto program at a fixed 23 °C target, or (c) enter Forced Cooling for service/testing. Use the timings below to operate it safely.
Where to find the button
Open the front panel (lift from the bottom edge).
Look along the right-hand side of the display/PCB area for a small “MANUAL/AUTO” or “ON/OFF” push button (sometimes a tiny tactile switch).
On some models it’s recessed; use a pen tip.
Button functions (timed press)
Short press (tap): Start/Stop the unit.
Press 2–4 seconds: Auto at 23 °C
If room temp > 23 °C → unit cools.
If room temp < 23 °C → unit heats.
Press ≥ 10 seconds: Forced Cooling (maximum cooling output), ignores room temperature.
To exit Forced Cooling: press the button again to stop, or power-cycle the indoor unit, or send any command from a remote (if available).
Indications you’ll see
Operation lamp turns on when running; may flash briefly at start.
In Forced Cooling, fan and compressor ramp high; louvers move to a typical cooling position.
Safety & usage notes
Forced Cooling is for testing/commissioning only. Do not leave it running unattended—risk of coil icing or condensate carry-over if the room is already cool.
Avoid using Forced Cooling at low ambient outdoor temperatures.
Auto 23 °C is a simple fallback; it will not follow custom schedules, timers, or special modes.
If the unit doesn’t start:
Confirm mains power and isolator/fuse.
Ensure front panel is properly closed (some models have a panel interlock).
Check that there’s no active error code (operation/timer lamp patterns).
If wired controller or BMS is fitted, local manual control may be disabled.
Return to normal operation
Once a remote is available, send any command (e.g., Power OFF, then Power ON) to resume standard control with your chosen mode, setpoint, and fan.
