Put into bat, Warner (28-ball 61) and Shikhar Dhawan (37) stitched an 86-run opening stand to help SRH post 197 for seven in 20 overs.
Warner (378 runs from 8 games) struck from the word go as the left-handed opener hit 11 fours and a six to register his 5th half-century of the tournament and get the orange cap from Rajasthan Royals' Ajinkya Rahane (339 from 9 matches).
Bhuvneshwar Kumar (2-32) drew first blood after the medium-pacer got the dangerous Brendon McCullum (12) to chip an inswinging delivery on to his stumps as the home crowd erupted with joy.
Moises Henriques (2-20) then struck in the sixth over to get Dwayne Smith (21) back in the dug out just when the West Indian was looking to set things on fire. The powerful opener hit 3 fours and a six in his 19-ball stay.
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Henriques continued to make in roads after getting Suresh Raina (23) in his very next over to to hurt the CSK chase. The left-hander, who hasn't missed a single IPL game since the inaugural edition was looking good after hitting 3 good sixes.
The run was probably the turning point as Dhoni pushed the straight full toss back towards the bowler but hit Faf, then the ball hit the umpire and went to the left of the bowler. Faf thought there was a run there and took off, but by the time he turned around, Reddy had picked the ball up from wide of the crease and hit the stumps.
In the end, Dwayne Bravo managed an unbeaten 20-ball 25 to just reduce the margin of loss in the final few overs.