Re: replace thermostat
I’m a little concerned the ice is only forming at the top of the back panel as this could indicate a system error.
What could be happening is the “cold” ice is not reaching the thermostat probe so the thermostat never switches off the compressor as it thinks it’s not cold enough.
insulation breakdown can also cause this, I would ask an engineer to check it out for youin all honesty as replacing the thermostat is a 50{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} possibilty on this one.
Hope this helps.
Dave.