I have a Waterway pool automation system which I installed myself and has been running fine for years. Yesterday, the pool temp registered 90F when it was only 70F. I powered off the system, powered it back on and it is the same. I believe it has failed. The only Waterway named part I can find is $150!!!!! I am waiting for confirmation from Waterway on the correct part # and where to buy it, but I noticed that Pentair and Hayward water temp sensors that are identical in "looks" are $10-20. Are they interchangeable or is there a way to confirm?