If the price of the underlying security falls, the put purchased increases in value by the same amount as the loss incurred by writing the call. If the underlying security's price increases, both the put and the call expire worthless. In both situations, the trader is risk neutral, but profits from the difference between the price at which the call was sold and the put was purchased.
As with all arbitrage opportunities, conversion arbitrage is rarely available. This is because any opportunity for risk-free money is acted on quickly by those who can spot these opportunities quickly.