Rocket Espresso Water Level Auto-Fill Regulator – A199907550 Restore automatic boiler water management to your Rocket Espresso machine with this genuine OEM water level auto-fill regulator control box (A199907550). The water level regulator monitors the boiler water level and automatically activates the pump and fill valve when the level drops too low — keeping the boiler correctly filled for consistent steam and espresso performance. Specifications Part number: A199907550 Voltage: 230VAC Function: Water level auto-fill regulator / control box Compatible Models Rocket Appartamento (April 2021 – ) Rocket Appartamento (April 2023 – ) Rocket Giotto Cronometro R (September 2019 – ) Rocket Giotto Cronometro V (September 2019 – ) Rocket Mozzafiato Cronometro R (September 2019 – ) Rocket Mozzafiato Cronometro R (April 2023 – ) Rocket Mozzafiato Cronometro V (September 2019 – ) Rocket Mozzafiato Cronometro V (April 2023 – ) Symptoms of a Faulty Water Level Regulator Boiler not filling automatically or running dry Pump running continuously without filling the boiler Machine displaying low water warnings despite adequate reservoir level Inconsistent steam pressure due to incorrect boiler water level Machine not reaching operating temperature correctly Frequently Asked Questions What does the water level regulator do? The water level regulator (auto-fill control box) monitors the boiler water level via a probe or sensor. When the level drops below the set threshold, it activates the pump and opens the fill valve to top up the boiler. Without a functioning regulator, the boiler can run dry, causing heating element damage and machine failure. Is this a genuine Rocket Espresso part? Yes, this is a genuine OEM Rocket Espresso replacement part (A199907550). Can I replace this myself? Water level regulator replacement involves working with mains voltage electrical components. This repair should only be carried out by a qualified technician. Our Sydney-based team can assist — contact us to book a service.