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Error 28 - Temperature Too High
Description
Some treadmill motor controllers monitor the temperature of the motor
controller output switching device. Typically, these motor controllers
use a fan to force cool the output devices heat sink. This error
indicates that the heat sink temperature has exceeded maximum.
Possible Causes
1 The lower PCA cooling fan is clogged.
2 The lower PCA cooling fan is inoperative.
3 The lower PCA is defective.
Possible Remedies
1 Check the cooling fan mounted on the lower control module to ensure
that the fan is not clogged with dust. Thoroughly clean the fan and
ensure that it spins freely. Insure that machine motor cables are
not routed to close and not touching the fan.
2 The lower PCA is clean and unobstructed but the fan does not spin.
Ensure that the fan wiring is securely and correctly connected to
the lower control module. If the fan is unobstructed and the fan
wiring is good, replace the lower control module.
3 Substitute a known good lower control module to determine if the
lower control module is defective.
NOTE: Some older lower control module software revisions used error
28 as a "catch all" and therefore reported a wider range of errors as an
error 28. Verify lower control module software is current.
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