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The thermistor comparison is not performed during low ambient
cooling or defrost operation.
Failed Thermistor Default Operation
Factory defaults have been provided in the event of failure of
outdoor air thermistor (OAT) and/or outdoor coil thermistor
(OCT).
If the OAT sensor should fail, low ambient cooling will not be
allowed and the one--minute outdoor fan off delay will not occur.
Defrost will be initiated based on coil temperature and time.
If the OCT sensor should fail, low ambient cooling will not be
allowed. Defrost will occur at each time interval during heating
operation, but will terminate after 5 minutes.
If there is a thermistor out of range error, defrost will occur at each
time interval during heating operation, but will terminate after 5
minutes.
Count the number of short and long flashes to determine the
appropriate flash code. Table 23 gives possible causes and actions
related to each error.
OAT Thermistormustbe
locked in place with s pherical
nibendfacingtowardsthe
frontof thecontrolbox
Fig. 57 – Outdoor Air Thermistor (OAT) Attachment
OCT Thermistor
must be secured
tight on stub tube.
Fig. 58 – Outdoor Coil Thermistor (OCT) Attachment