I was trying to activate the cleaning program on my Expobar office control and I must have activated some mode. It now always brews for a few seconds, then purges, then starts brewing again. Does anyone know what buttons I pressed to activate this and how to turn it off again?

Sounds like you have activated preinfusion and inadvertently programmed a short shot volume. To adjust turn off the machine at the power switch then, while holding down the required button on the left-hand Drink buttons, turn the machine back on.
1 Short Espresso. Enable preinfusion
1 Long Espresso.Disable preinfusion
2 Short Espressos. Auto cleaning
2 Long Espressos.button flash at rest

Thanks, that worked. Is preinfusion something that's recommended on these machines?