We are having trouble with our ~4 year old Whirpool WHES44 water softener. When placed in service mode, there is no flow indicating through the turbine. I’ve replaced both the turbine and flow sensor (even though testing with a magnet showed they were working correctly) and still have no flow indicating on the display. So, I replaced the control panel. Again, no flow indicating. I was doing more troubleshooting and noticed that during the regeneration cycle, the turbine and flow sensor and registering flow during the different stages of regeneration. However, once the softener enters service mode, we lose any flow detection. Are our problems much deeper? Like a cam? Thanks in advance.