▶ Make sure the grinder is dialled in properly [see page 10]
▶ Make sure the yield is correct in each group head [see page 11]
▶ Make sure the baskets inside the portafilters are the same.
▶ The coffee machine must be set up on 90° to 94° and on 8 to 10 bars of pressure
▶ Check the flow meter in each group head
