'Soft tapping' sound Blomberg BRFB0900: 24 Inch Built-in Bottom-Freezer Refrigerator

Our Blomberg built-in bottom-freezer refrigerator has suddenly developed a ‘tapping’ sound (not terribly loud but bothersome nonetheless) ostensibly coming from the bottom of the appliance. The appliance works perfectly. The tap frequency is about a couple every second. It continues for 10-15 minutes, every 30 minutes, and goes on all day long–but I can’t say the timing is consistently that way. It’s more prominent on hot days (80F+). Virtually disappears on cooler days (75F-). In my opinion, the sound does not resemble a faulty relay…specially with it coming and going with temperatures. But what do I know!

I have difficulty triggering it by leaving either fridge or freezer door open. I’m also not sure if it associated with when the compressor kicks in…I really can’t tell.

Any hypotheses on what might be the cause is very welcome!

Mo


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