A proper functioning thermostat is necessary to maintain engine good health.
Seems like thermostat struck open.
Packing in PS printed box does not mean guarantee for the genuine one unless you get PS workshop.
The one u got as Kabli may not genuine pullout. Any used can part can be claimed as kabli and genuine if not differentiate just by looking.
I once got Kabli thermostat that was original pullout from trust worthy person in Rs 300 and it working perfectly for last 2 year.
So either get real Kabli or genuine from PS workshop.
Have you checked both for opening n closing in hot water.?
Sent from Vega Racer