Panasonic ducted systems are typically operated from a wired wall controller mounted in a central hallway or living area, rather than a handheld remote. The display shows the operating mode, set temperature, current fan speed, and on zoned installations, which zones are currently active.A filter indicator lights up once the system's internal filter timer reaches its set number of running hours, prompting a clean rather than signalling a fault.If the display shows a numbered error code instead of the usual readout, the system has detected a problem and needs professional attention. Resetting the controller does not resolve an underlying fault and can make diagnosis harder for a technician.