Re: Fridge keeps freezing on the back wall
Lara,
Assuming that the ice is not presently there, you should find a channel running across the lower part of the back wall. At its lowest point there will be a drain hole, connecting to a drain hose. This allows condensation to drain away to the compressor tray to evaporate off. If the hole or hose is blocked, it can cause ice to build up over time. Clean out the hole and see what happens.
Should this not solve the problem, please post back with the model number, so as more precise information might be given.
Regards,
Penguin45.