I'm on my third sensor after less than four years of owning my pool. Both times my sensor went out, I received error codes 125 and 194. My first sensor was covered under warranty, but I had to buy the second one. Cold weather may be playing a role, as it happened both times after a freeze. I always clean my sensor and cell 3 times/year.
Is this just luck of the draw, or should I be using something other than a tooth brush to clean the sensor?