SF error I have an SF error temperature sensor failure on my heater, can anyone tell me what the part number would be for the replacement part.

SF (not 5F) = Temperature Sensor or Thermistor
HS = High Limit Sensor
Heaters Set Temperature out of Sync with actual Water Temperature.
Heaters Maximum Water Temperature has been Exceeded.
A few reasons this occurs...

• Low water flow thru heater, check :
  • Dirty Filter
  • Opened By Pass Valves
  • Plugged pump impeller
  • Dirty/Full baskets at skimmer or pump
  • Anything that may reduce water flow
• Sensor could actually be doing its job, in a different aspect, Thermostat failure, and water is overheating in spa or pool?

But anyway, your heaters fault code you asked about does not necessarily mean the sensor failed, but is only informing of a problem.

The two may be related? If the right problems are present...
HS = High Limit Sensor
SF = Temperature Sensor or Thermistor
Heaters Maximum Water Temperature has been Exceeded.
Heaters Set temperature not in line with actual water temperature.

A few reasons this occurs...

• Low water flow thru heater, check :
  • Dirty Filter
  • Opened By Pass Valves
  • Plugged pump impeller
  • Dirty/Full baskets at skimmer or pump
  • Anything that may reduce water flow
• Sensor could actually be doing its job, in a different aspect, Thermostat failure, and water is overheating in spa or pool?

But anyway, your heaters fault code you asked about is does not necessarily mean they failed. They are informing of a problem.

error code is SF. temp sensor failure

The code is SF. This is a teemperature sensor failure. Check the wiring on the electroniics bord and confirm its not damaged and that it is securly plugged in. If all is good than the temperature sensor will need placing.m either a gas fitter or swimming pool reepair center will help with this is your not comfortable replacing it

SF is the code for Temperature sensor input failure. check wiring that goes to temperature sensor for brakes or cuts, sensor is located on right lower side of heater where water lines go in. you have to remove the 6 screws to take the side panels off above and below the water lines. sensor is visible then.follow wires back to control board and make sure they are securely pluggin in to board and all broken wires fixed or replaced. If no broken wires or loose connections, Replace temperature sensor.

The code SF indicates there is either a bad temperature sensor or the input to heater is faulty. I would buy a temperature sensor from a pool supply suppilier and install it. That solution has a very high likelihood of being successful. If you have a few tools and a little mechanical ability installation should be easy. I hope this helps

Temperature sensor failure code.Check the wiring on the sensor or might be a bad sensor. Here is the link for the heater manuals. This is a general code depending on Make and Model...

Thank you for posting your question here on Fixya.com.

SF refers to the temperature sensor so short of disconnected or damaged wiring; you will need to replace the temp sensor. Your part number should be IDXLTER1930. We stock the original Hayward part and sell them for $48.94. If you want to order one use the contact feature found along the bottom of our page at www.arrowpools.net.

From your owner's manual found here.



If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!

John