An illustration of an open refrigerator displaying a red error warning screen with electrical sparks in the background
Composite: Guardian Design/Getty Images
Composite: Guardian Design/Getty Images
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Alex Pearce was doing the morning rounds at his fruit and vegetable wholesale business in London on Monday last week when he noticed something odd.

The defrost light on refrigeration unit 2 was on, and the panel reading was 150C. Unit 4 was the same.