Sf" Or "Hs" Code - Hayward HC Series Troubleshooting Manual

8. Service LED ON: "SF" OR "HS" Code
The "HS" (High Sense (water temperature)) will appear if the water sensor is reading
above 105° OR if the sensor detects an increase of more than 6° with-in 60 seconds.
Verify the pump is running & adequate water is flowing through heater.
"SF" Code "HS" Code
Step 8A Step 8B
IN OUT
The "SF" (Sensor Failure) indicates that the
Verify the water inlet & outlet are not reversed;
thermistor (or temp sensor) is reading out of range.
reversing plumbing will cause the "HS" error code.
Ohm temp sensor, checking each red to black. IF
Follow the steps outlined in 8A. IF the thermistor is
the two readings differ, replace thermistor. IF NOT,
good, replace the ICB (pg. 25).
replace ICB (pg. 25).
41