Hayward H400FDN Universal H Series Troubleshooting Guide - Page 41

HS, are inlet/outlet reversed?, Check display for SF

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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. Check display for "SF" Step 8A "HS", are inlet/outlet reversed? Step 8B The "SF" (Sensor Failure) indicates that the thermistor (or temp sensor) is reading out of range. Ohm temp sensor, checking each red to black. IF the two readings differ more than 1°, replace thermistor. IF NOT, replace ICB (pg. 20). Verify the water inlet & outlet are not reversed; reversing these will often cause frequent occurrences of the "HS" error code. Follow the steps outlined in 8A. IF the thermistor checks-out, replace the ICB (pg. 20). 41

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The “SF” (Sensor Failure) indicates that the
thermistor (or temp sensor) is reading out of range.
Ohm temp sensor, checking each red to black. IF
the two readings differ more than 1°, replace
thermistor. IF NOT, replace ICB (
pg. 20
).
“HS”, are inlet/outlet reversed?
Check display for “SF”
Step 8A
41
Step 8B
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.
8. Service LED ON: “SF” OR “HS” Code
Verify the water inlet & outlet are not reversed;
reversing these will often cause frequent
occurrences of the “HS” error code. Follow the
steps outlined in 8A. IF the thermistor checks-out,
replace the ICB (
pg. 20
).