Error Code 172 and 186

Those are codes relating to the sensor. Do you have enough flow through the cell? You will want to make sure your filter is clean along with the cell and sensor. If all seems well with those items then make sure the sensor cable is fully plugged in to the electrical board. If that is fine then your sensor might need to be replaced. Do you have the newer 3 port cell or the old 2 port cell and how old is the system?
 
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.