Hayward H150FDN - SF or HS Code

“SF” OR
“HS” Code
Check display for
“SF” code
Is “SF” code
present?
The “HS” code
stands for High
Sense (water
temperature).
YES
NO
Ohm thermistor,
checking each red to
black, do the readings
differ by more than 1°?
40
Replace
thermistor:
FDXLTER1930
YES
NO
8. Service LED ON: “SF” OR “HS” Code
Replace ICB:
FDXLICB1930
Make sure water
inlet & outlet are
plumbed correctly,
are they reversed?
YES
Plumb correctly in
compliance with
installation manual
NO
Ohm thermistor,
checking each red to
black, do the readings
differ by more than 1°?
NO
Replace ICB:
FDXLICB1930
Replace
thermistor:
FDXLTER1930
YES