My local pub has a Beermaster BM 22-43 Cellar Chiller. I need to change the set temperature. The controller (see attached photo) has 3 buttons F, C and * (a snowflake). F and C appear to just change the display from Celsius to Fahrenheit, when I press the * it asks for a code. I have read on another thread here that their is a hidden button
Any help would be appreciated, or even a user guide/manual
Alan