For the last couple of days I've been observing a mysterious power draw on my refrigerator:


(see attached file if this URL doesn't resolve)

Every 10 minutes something starts up, draws about 100W for 5 minutes, and shuts down again. This happens continuously 24h.
The compressor cycle is working fine and the fridge is holding the temperature fine. I can't see any obvious problem.

Any ideas on what might be causing this? I'm worried that whatever component this is, continuous use will cause it to fail.