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The remote control (often featuring glow-in-the-dark buttons) allows you to cycle through several operating modes:
Use the Swing buttons to control air direction. "V-Swing" manages vertical movement, while "H-Swing" manages horizontal movement (available on select models). Voltas Vertis Plus Split Ac User Manual
Newer Vertis models include a self-diagnosis feature to help identify technical issues. Voltas Vertis Plus Split Ac User Manual
Provides rapid cooling by instantly boosting the compressor and fan speed. Voltas Vertis Plus Split Ac User Manual
Gradually increases the set temperature by 1°C per hour (up to 2°C total) throughout the night to save energy and prevent over-cooling.
An E4 code typically indicates the unit has entered "defrost mode" because it became too cold, which may sometimes be caused by a faulty temperature sensor.