WATERSTAGE™ ATW Systems The indoor unit doesn't start to operate immediately after it is switched on.

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If the unit does not start, look for an error indicator, either on the indoor unit or the outdoor unit.

If the failure is in the outdoor unit, you can still operate the indoor unit in heating mode using an electrical backup heater.

When this problem occurs, call a professional service technician as soon as possible to avoid a high energy bill.

WATERSTAGE is a trademark of Fujitsu General Limited.