I don't know how much more to replace (at this point could have bought a whole new system). We got the 175/182 codes earlier in May. Replaced the flow sensor. Then got the 123 code. Cleaned the salt cell. Still a code so we replaced the salt sensor. Was running with no code for one day, now getting the 123 code again. Is it the front board or the back board or both? Sooooooooooo frustrated. Husband just wants to fill the thing in with dirt.