Hi! I have a Hayward Pro pool/spa system with Jandy valves and I'm trying to figure out how to switch them from pool to spa. Either I empty the spa or I'm heating the whole pool. Help please!

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

its on the main board if using a system 3 wire use pool spa and common see which wires go to which on sytem board put pool temp at desired temp then same with spa temp if jandy system go to pins 1 and 2 on long plug on top of board then go to pool and com at heater if jandy turn heater all the way up RS sysyem will govern heat

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.

The model #711 is a 1.5" valve, not the filter. The following link is for the top mount filters in the pro series http://www.hayward-pool.com/prd/Above-Ground-Pool-Sand-Filters-Pro-Series-Top-Mount-Systems_10201_10551_15009_-1_24001_14018_A.htm

No. Make sure there are no programs for the spa. Double check this. I assume this is a pool/spa combination. If so, check the valve actuators at the pool equipment. Do this by manually turning on the pool with your Remote control unit. There should be no water disturbance in the spa. If so, your valve actuators need to be reset. There is a metal toggle switch on the back of each valve that you can switch to set the valves to pool or spa.

*********** board at the equipment may also be the culprit. Try resetting it by pressing the small recessed reset button on the front of the panel with the tip of a pencil or pen. If neither of these slove your problem you probably need a new mother board. They are very expensive. Check to see if yours is still under warranty. Your builder can tell you this or you can email or call Jandy with your model and serial number found on the back of the board. Good Luck

Try consulting the owners manual for these pool filters. It has a pretty comprehensive troubleshooting guide. It should help you figure out how to set the system up.

http://www.backyardcitypools.com/images/hayward/pro-series-manual.pdf

Try this. On the suction valve their is a JVA... actuator and on the end of it their is a small toggle switch and all you have to do is change the position of this. 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.

I agree it sounds like a check valve. if the water in the pool matches the water level in the spa, or drains all the way (depending on how far the spa is raised) then it is the valve before the pump, but if it goes down to the jets (and not any further) then it is a check valve or valve on the retun side of the plumbing ( after heater or chlorinator).