Precor TRM 811.v2, Service Manual

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Error 28 - Temperature Too High / Drive Electronics
MCL
– Yellow
ASL
– Yellow Solid
Description
The Motor Controller monitors the temperature of the motor controller output switching device,
using a fan to force cool the output devices via a large heat sink. This error indicates that the
heat sink temperature has exceeded maximum.
Possible Causes
1. The lower PCA cooling fan or heat sink 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 Motor Controller to ensure that the fan is not clogged
with dust. Thoroughly clean the fan and ensure that it spins freely.
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 Motor Controller. If the fan is unobstructed
and the fan wiring is good, replace the Motor Controller.
3. Substitute a known good Motor Controller to determine if the Motor Controller is defective.
4.
5.
Error 88
– Temperature Too High / Motor Temperature Switch
MCL
– Green
ASL
– Yellow Solid
Description
The drive motor contains a thermal switch which will open when the motor temperature reaches
a specific set point.
Possible Causes
1. Motor thermal switch not connected/connector not seated completely
2. Bad belt and/or deck
3. Motor thermal switch failed open
4. Motor Controller hardware fault