Panasonic — Inverter type split a.c.

Aircon Job id : R[protected] dt[protected] is still pending
Background: purchased 2 split a.cs dt[protected], and no one turned during warranty period/even after Reliance digital raised to attend warranty call. Request you to check records.
Now mechanic says mother board and Fan needs replacement for which I need to pay for the Fan motor.
I have around 10 a.cs in my own flats and till dt I never replaced Fan.
How can it fail within this short period.
I need a free replacement and need to take back the old and do analysis for early failure and take corrective action.
Awaiting your early reply and speed up resuming a.c. working.
Thanks
Sriram.G
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