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“SF” OR

“HS” Code

Check display for

“SF” code

Is “SF” code

present?

The “HS” code

stands for High

Sense (water

temperature).

YES

Ohm thermistor,

checking each red to

black, do the readings

differ by more than 1°?

Replace

thermistor:

FDXLTER1930

YES

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