arriston fridge freezer error code A2?

its a model mtb 4558nf serial 303310073-8127287. the FF has been off for about 6 weeks while away and on return its been on for 2 days and not cold. The motor is warm and sporadically the fan comes on for a few seconds. on the freezer temp display is A2. Please help. Ive heard it might be the copper tube with the expansion bubble in it attached to the motor, is this correct ????