Warner, 26, pleaded guilty to showing dissent at his dismissal for leg-before-wicket in his one-day international against Sri Lanka in Sydney.
Warner was clearly seen expressing dissent at the decision, when he was given out after clearly hitting the ball before crashing into the left-hander's pads.
Warner was out for 60 and his dissent towards umpire Marais Erasmus during the fourth one-day match could have earned the Aussie batting star a suspension.
Warner was visibly upset at his dismissal as Australia looked like being bundled out cheaply and nation-wide television coverage could clearly detect swearing at his controversial decision.
Warner was leading Australia's survival with 60 from 73 balls and was sent packing with the home side at 5-125.
The thrashing top-roder star is now free to play in Australia's vital fifth and deciding limited-overs clash against the Sri Lankans in Hobart on Wednesday.
Australia must win the clash to square the series 2-2, after Sunday's match was abandoned when rain set in with Sri Lanka 0-14 in pursuit of the home side's 9-222.