Upon investigation no issues noticed with impeller or shaft. Found algae around impeller, cleaned it and reassembled unit but no luck, same cracking noise.
Next day noise became louder, when I reopened unit I found shaft in 3 pieces and even impeller was broken into two pieces .
Seems it was a dying shaft/impeller and cleaning increased friction.
Purchased items from ebay and applied vaseline on shaft and on the magnet. Reassembled unit, all good now.
I have read people never faced issues with Eheim filters for years, mine broke in a year seems to be one of the case.
Lesson learnt that clean and grease impeller unit periodically.
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