Hi, I have a Bosch upright freezer frost free GSU34423gb/01 aprox 11 years old, 200cm x 66cm, this machine has always been set at -20, recently it has been fluctuating between -10 and -20 for no reason, it was -15 this afternoon now its -13, yesterday it was -18 then back up to -20, any help or ideas would be most great full.
Just gone out there again and its now at -19, this has been going on now for about 4 weeks, because its such a big freezer its not easy to empty and turn off for 36 hours as its 2/3 full, food seams to still be frozen well.