A hotel kitchen manager in Kensington called us worried about his electricity bill. It had jumped 40% over three months and he couldn’t figure out why. We found the answer in the basement — his walk-in cold room compressor hadn’t cycled off in weeks. It was running 24/7, pulling the temperature down to 1°C, then...

We get called to high-pressure trips more than almost any other refrigeration fault. A pub in Clapham, a restaurant in Soho, a cold store in Barking — the story is always similar. The condensing unit has been running fine for months or years, then one day it trips on the high-pressure safety switch and won’t...