boussagues

LF means low flow. Firstly check your pump!! I was getting a LF problem and replaced the sensors, When I started the pump I still had the same problem, I then discovered that the sensors need a certain flow of x cubic metres an hour. I took out the pump and there was some crud in the impellers. I cleaned it out, put the old sensors back in and refilled it. It then worked. Spent $120 on sensors for nothing.