waterlogged

We've had our tub for about 4 years (2003 model) and have not had problems with the filter cycle until recently. About a month ago I had to reset the filter cycle program after I noticed that the 2-speed pump was not coming on. (Circulation pump seems to be working fine). I can manually turn on both pumps in all speeds, but the filter cycle does not seem to be tiggering the 2-speed pump anymore. Any suggestions?