11
It is normal for the motor to rock back and forth
on start up. Do not replace the motor if this is
the only symptom identified.
If the system is excessively noisy, does not appear
to change speeds in response to a demand (Heat
or Cool), or is having symptoms during the cycle
such as a tripping limit or freezing coil, check the
following:
Wait for programmed delays to time out. If
delays are too long, then reset them using the
manufacturer’s charts.
Ensure the airflow settings are correct for the
installed system using the manufacturer’s charts.
Remember that the change in airflow between
continuous-fan speed and low stages of operation
may be very slight depending on the size of the
system. If the system is operating normally in
each stage, then there is no problem.
Remove the filter and check that all of the
dampers, registers, and grills are open and
free flowing. If removing the filter corrects the
problem, clean or replace with a less restrictive
filter. Also check and clean as needed the blower
wheel, secondary heat exchanger (if applicable)
and evaporator coil (if applicable).
If this does not correct the problem then:
Check the external static pressure. If it is
higher than the manufacturer’s recom-
mendations, correct the airflow restriction.
Models 2.0 / 2.3 / 2.5 / Eon
®
/ 3.0
Premium ECM Motor Diagnostics
IF THE MOTOR IS RUNNING
1.
2.
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