Dyson CRO2 washing machine - what are faults F1 and F2 ?

I get a message which includes the codes F1 and F2 after resetting the machine from a call Dyson telephone number. The faults clear but reappear after I start a new washing cycle - I think there may have been a problem with coin trap which is now clear. the washing cycle runs for 3/4 minutes then halts with the telephone message. Clicking noise sometimes precedes the message before the cycle stops.

The washing cycle includes some warming, operation of the drums in both directions, water input and output, all before stopping.