My Jandy Spa is draining when is Auto mode

His is not typically a control panel issue but more likely a valve issue.

Your valves are set as follows wih a few minor variations.....
Pool mode- sucks from pool skimmer and or pool vac line and returns water to both the pool and spa.
Spa mode - self contains the spa , meaning water is sucked from the spa and returned only to the spa.
If your spa is draining then most likely one of your electronic valves is failing...most likely it's the return valve so what is happening is the water is sucked from the spa and returned to the pool instead of self containing the spa.
Easy check is to be next to the equip when spa mode is selected and two valves should move and align properly, the return side valve is most likely not moving or it is not moving into the correct position.
The fix is either adjusting the valve acuator or buying a new valve acuator.
Another thing to check is on the main panel circuit board to ensure the return and auction 3 pin plug ins are still connected.

check to see if jandy actuator switch is on also see if wire isnt cut

You may have to open the valves and reset the cams. Not too tricky, just a lot of trial and error to get it just right
FYI when you decide to replace the actuators, Intermatic now makes a direct replacement for both Compool (Pentair) and Jandy models. They are significantly cheaper.

The valve actuator on the suction side is either bad or the toggle switch on the back is in the wrong position. There are 3 positions for the switch on/off/on. It should be in either be all the way up or all the way down. In spa mode move the toggle switch. If it still doesn't move then you have a bad actuator. If it moves someone has moved the switch.

You RETURN side valve actuator has malfunctioned and did not move into the spa return position. Most actuators have a toggle switch on them where you can over ride the system.
The 3 positions are; normal, off, and reverse. You can check to see how the valve is moving by flipping the toggle switch. If the actuator is more than 10-12 years old it may need to be replaced. Actuators are standardized between manufacturers and new ones will run about $120, easy to change out.

On the automated valves there are tiny switches on one end or under the valve actuator. When you switch to the spa mode the suction valve should should move to fully block pool drains. The return valve should fully block the pipes to the pool returns and spa fountain. If one or both of these valves is not fully blocking the pipes to the pool then the tiny switch on that valve is in the wrong position or an operator is defective. The middle position of either of these switches turns the operator completely off so it cannot move. That is the position to avoid unless you want to operate it manually. One of the other switch positions caused the valve to move in one direction and the other switch positions causes the valve to move in the other direction. If you set the switches so when in the spa mode water is circulating only in the spa then you have the valves in the right position. Next, place the system into the pool mode. Both valves should move to the other position. If not then the valve operator that doesn't move has a problem. It could be the operator, the wiring, the control panel or a stuck valve in that order. All of this sounds complicated but once you know how the operators should act when you flip those tiny switches and how the valves should act when in the spa and the pool mode then getting the switches set right is simple. I hope this helps.

the only thing you can do since the jandy does not have a "winter" mode is switch the valves off. Once you have the valves in spa mode, there should be a toggle switch on the valve actuators. You can set the switches to the middle position and that will lock them in that position. You will probably have to re-winterize the pool lines.

one of your automatic jandy valves is not working and if is not all the way around for pool the system on pool mode won't start you have two automatic jandy valve actuators one on the suction side and one on the return side go there and see wich vave still on spa mode this actuator needs to be replaced also check your control inside your house make sure you don't have it in spa mode

The problem is in your plumbing. Someone put a valve in an incorrect position. I would have to see a picture of your plumbing but if you can follow the flow of water. When you put it in spa mode, look at which valves turn and which ports open up. If it is doing anything other then sucking water from the spa and returning it only to the spa, then that is why it is draining. Again it would be great if you had a picture. What I have seen before is somebody plumbing in the pipe for a pool cleaner after the valve that send water to the spa. This would result in water from the spa slowly draining out of the pool sweep line. Good luck.