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Are both indoor and outdoor short cycling or just one or the other and how long will it run and how long off?
Do you have refrigerant gauges so we can see what pressures are doing? Most of the time the outdoor will short cycle due to high or low pressure.The unit has a low pressure switch that will shut it off if refrigerant charge is low,indoor fan not moving air across evaporator or dirty filter drier and it has a high pressure switch that will shut it off if metering device fails, blocking flow of refrigerant, dirty outdoor coil or outdor fan not coming on.
I suspect the metering device on indoor coil is not opening causing high head pressure in heat mode. If refrigerant was overcharged we would have higher pressures in cool mode also.
Good deal.Let me know if you have any more issues I am here