With a split unit aircon unit the compressor and fan would keep running even when the unit inside was turned off.
I figured out it was probably the relay sticking, so I replaced it on the control board inside the unit inside and it seems to work fine now. The other relays on the board were for different fan speeds.
However I'm having some second thoughts, is it probable that the outside compressor/fan unit has it's own relay that could be sticking? from what I could look from this units design I think the 220v AC power going to the outside unit is routed through the inside unit and the 220v flows to the relay at all times so the relay I changed would have caused the compressor to be on all the time if it stuck in the closed position.