Upon restart goes into filter cycle in high speed instead of low speed. Every filtration cycle now runs at high speed.
First get the speeds right, you should be able to switch the red and black wires to get filtering on "low".
A pump running on "high" speed could be giving you the extra heat.
Servicing spas and hot-tubs can be DANGEROUS! If you do not know what you are doing, then please, do not attempt to use the information contained in this message, call a Spa Service Company to service your spa!