Reversal off EMA

Simple script find when a probable reversal will start. When price moves sharply away from the 13 EMA a BUY/SELL signal will pop up. Scripted to work on 5m 1h, 4h, and daily chart. But it doesn't work on all charts. Not sure why. I'm a forex trader and use this on NZDUSD. It doesn't give too good results on the JPY charts. I think its a fairly good reversal indicator. It definitely doesn't catch them all, and if there is a strong bearish or bullish impulse it doesn't work too well. But with all indicators, you need other conformations when to get in and when to get out. Hope it helps someone.