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GB WARNING: After emptying , put the water tank very carefully back in its bay so as not to damage or interfere with the switch which is connected to the float. MAINTENANCE WARNING: Before any maintenance operation turn OFF the main switch and take out the plug. To work efficiently the air filter and the internal parts of the humidifier must be cleaned periodically. To clean the air filter apply compressed air or wash with tepid soapy water. To gain access to the internal parts unscrew the exter