heater malfunction

I have an electric pool heater which works but the compressor never shuts off. Everything works, that is, I set the desired water temperature, for example 85 degrees, and the pool heater fan and compressor are on and hot water comes into the pool. When the pool water temperature reaches the set...

Hello all, I have a Hayward H250FDN model heater. I need to replace the gas valve on it. The like for like replacement is out of stock online ( at regular price). Can I use a universal gas valve? Is there is logic internal relay signals that are specific to the OEM gas valve. The OEM is...