SG3H-SS
ANSWER

This controller only has basic errors.

HHH showing on display (Flashing) means inner temp has reached higher than maximum allowed HIGH set point OR if cabinet sensor is short circuit. So this means unit for one reason or another it is not cooling, go to 'My fridges doesn't cool at all' 

LLL showing on display (Flashing) means inner temp has reached lower than maximum allowed LOW set point OR if cabinet sensor is short circuit. There is problem with either sensor or unit has iced up.
*Either of these errors cause alarm also, this can be stopped by pressing any button

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