Check electrical installation Exchange Repair and/or exchange Identify and seal the leak, replace the seals and/or hoses if necessary. Check the hose connections between the pump heads, replace the hoses and/or fittings if necessary. Repair and/or exchange Exchange of the diaphragm (see chapter 7.2) Exchange of the valve (see chapter 7.2) General maintenance / leaning Cleaning condensates and foreign objects out of the valves. General maintenance / cleaning Exchange of the glass parts or seals Exchange of the cable(s) Electrical system to be checked Repair and/or exchange Check the input and correct if necessary Switch the device off, and switch it on again after three seconds Replace the controller