Pureit / Hindustan Unilever — Filter lights are red as expected by serviceman

Address:	Bangalore, Karnataka, 560076
Website:	www.pureitwater.com/IN/pureit-water-purifiers/pureit-marvella-ro-water-purifier

Plz note i had purchased marvella uv water purifier in year 2015. After completing 1 year problem starts.

Problem: suddenly sf and gkk2 filter lights became red. Service guy came and touched something on back side circuit and fixed the issue immediately. But he told that better to take extended warranty (Which costs 2100/-) because if all lights became red, then you have to swap all the circuits along with pump which costs around 5000/-.

My question:
How did he know that it would become red soon? Is this common issue? Why company is not showing the interest to fix this known issue?

Reason for asking above question is, all lights became red next day itself. Is this something wrong in its circuit? Is this programmed intentionally to get such kind of error? Even though filter is able to work efficiently, why does circuit shows 'red' lights?

Expecting quick response from pureit...

Regards.
Hariprasad
Mob: [protected]