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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.
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.
sf sdf Sorry to hear about your problem. Sounds like you have a defrost issue. Hence your unit is not defrosting. All of this apply's if your freezer side has ice on it. If not. you have other issues Here is a list of some things that can go wrong. 1. Defective heat coil 2. Defective defrost timer 3. Defective defrost sensor 4. Defective Fan 5. Defective compartment inlet damper (on some models)
You should call a service company to resolve your issue.
Since I tried to help you, Please help me and Rate/Vote on the response. Thanks
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...
I think you must be mistaken about your heater being a millivolt heater. They have not mfg these heaters for some time. And they probably would not give you an SF error. If you have an SF error, it is a newer model with a digital board. Millivolts usually have two analog temperature dials on them and no digital readouts. That should be the part. HTH
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