67
Table 11
Fault Code FOU
This display indicates that the outdoor sensor is defective, either shorted or open, or the outdoor
temperature is below –40
o
F. NOTE: The installer must choose YES for Function 12 to enable this feature.
The unit will continue to operate when this error is displayed but the control will ignore the outdoor reset
feature and run at the programmed temperature. The bottom line of the display will indicate the status of
the pump.
Remedy:
Inspect wiring from outside sensor for damage or shorted connections and repair as necessary. Measure
resistance of outdoor sensor and compare to resistance chart. If not within range on chart, shorted or
open, replace sensor.
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