Have a Jandy Aqualink RS4 coupled with a Jandy 7441 spa side switch. A few months back the spa blower began periodically powering on and off. This would happen when the system was and was not running. First thing I did was troubleshoot the switch by checking continuity from the black wire to the other wires. All checked out but on the side of caution I replaced the switch and found the problem remained. I then proceeded to replace the power control board, completely reprogrammed everything and all functions were normal except for the spa blower which still periodically powered on and off. Next I replaced the relay for the blower, you guessed it, it the problem still remains. Ultimately I removed the white wire from the spa switch block thats connected to the pcb and the problem is gone but as you can guess this kills the ability to use the switch to turn on the blower from the spa. All other functions of the system work normally. The blower can still be activated from the panel inside the house. I'm just at a complete loss as to why this continues to be a problem. Any advice would be greatly appreciated.