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Fujitsu FO20R Series Installation Instructions Manual page 42

Variable speed r-410a heat pump outdoor units
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8.0 ACTIVE SYSTEM PROTECTION FEATURES
8.13 Sensor Failure Default Operation
If the controls sense an externally connected sensor
has failed, the system will enter a fail safe operating
mode and will continue to condition the space until
the sensor can be replaced. A fault code will be
8.14 Exiting Active Protection Lock-Out Mode
Exiting an Active Protection Lock-Out mode can
be accomplished by disconnecting electrical power
to both the indoor and outdoor units for 1 minute
and then restoring power. Keep in mind there
was a reason for the lock-out, so the fault code
42
displayed on the Digital Control Center and Variable
Speed Outdoor Control identifying which sensor has
failed. See the table below for the default operation
for a sensor failure.
on the Variable Speed Outdoor Control (VSODC)
or Digital Control Center should be read to assist
with diagnosing the root cause of the lock-out and
corrective action should be taken to prevent the
system from repeating the lock-out.

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