This can happen when the intake filter gets clogged.

You just need to disassemble the intake filter and clean it.

You can see how to do it in the video above, starting at 15:04.

1. V1 intake filter

Use citric acid

Clean it weekly/fortnightly

1. V2 intake filter

Use baking soda instead of citric acid

Clean it at least once a month.

You may need to scrub it using a pipe cleaner if it's clogged badly.

When this symptom happens, the machine may make a louder pump noise than before since it sucks air along with water.

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