Check internal bypass spring probably broke also check chemistry PH and alk
SOURCE: Temp Sensor
The temp sensor known as the engine coolant temp. sensor tells the computer if the engine is overheating and so forth and tells the injectors how much fuel to give the engine. The temp. sending unit is what controls what your guage reads. It sounds like you need the temp. sending unit. It located near the thermostat housing with a single pole connector.
SOURCE: Wireless thermo clock not reading outside temp
I've had a similar problem with another model, an Oregon Scientific Model IWA-80055 Wireless Thermo Clock, in which when I replaced the batteries in the remote sensor, the clock would not read the temperature from the remote sensor.
I found it fairly consistent to solve this by taking a battery out of place in the clock and putting it back in. Unfortunately this also messed up the clock's time and date. This is also in the instructions catalogue for the device, check and see if yours gives a similar solution.
SOURCE: Heat pump will not start
Could be a firmware issue and require a new mother board. Unfortunately, you probably have done all you can on your own. Time to call the local HVAC service person...
SOURCE: Hayward pool heater - p5 code
The code is "PS" for Pressure Switch and means there is insufficient pressure to operate (low flow) or the switch itself is bad.
SOURCE: THE ERROR CODE READS SN.
Did you replace both temp sensors or just one? Did you make sure that the new sensors are the same model? If you did replace both sensors with the correct ones, the main board is bad and will have to be repaired or replaced. The actual manufacturer of your controller can provide limited technical support for someone who has the ability to use a multi-meter and test a few components at the spa over the phone.
Thank you for posting your question here on Fixya.com.
An SF error refers to the temperature sensor. Per your Hayward owner's manual:
From your manual, found here: http://www.hayward-pool.com/pdf/manuals/Manual285.pdf
The sensor screws into the inlet/outlet header and has three wires and a plug that make their way to the back of the control board. Check to see if there is damage to the wire(s) and repair if there is. Otherwise you need a new thermistor. Your part number should be IDXLTER1930.
If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!
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