how to fix fridgefreezer Hotpoint Mistral Plus Frost Free?

Motor or compressor began to run v v noisy, previous day had run with occasional low clacky noise. For the couple of weeks prior, the temp display was flashing its thermometer ref the freezer, but contents appeared still frozen. After 30mins v noisy running I switched off, felt the surface on the top panel RHS seemed pretty hot, got the rear lower panel off, checked fan spin freely ok, compressor felt hot but about the same as long ago, found a bit of pipe maybe touching the compressor so moved it. Then left off the back panel, moved unit back but with a space at rear, switched on, put on fastfreeze=now1hr+ after the noise problem. Motor now come on and running at normal quietness, albeit fridge temp gone up to +9 which I figure may drop after a bit of fastfreeze time. So whats been going on? Is the temp panel misbehaving with just a glitch, with the bad noise from a bit of metal vibrating against the compressor a bit of coincidence? (cant have even partially seized cos sounds lovely right now). Or are the temp panel warning and readings, heat on the top RHS, and the noise related to one major problem?