Error 78 - Life Fitness Integrity SL Service Manual

Error 78

Error Message Displayed to user
• E78
• Notify Maintenance Motor Controller Error (Motor Thermal Shutdown)
Keep error on screen until OK button pressed.
Condition
Error sent by Motor Controller if it detects the internal motor thermal / temperature switch tripped. This disables the
motor until it cools down and the thermal switch re-engages.
Reset occurs when motor's internal winding temperature < 102 °C ± 11 °C.
Cause
• Motor thermal cable damaged or has a loose connection.
• Worn Belt / Deck
• Excessive user weight
• Restricted airflow (clear area / vents)
• High room ambient temperature
• Bad motor
Remedy
• If the motor is cool and this error is occurring check the motor thermal cable for damage, measure with DMM for
open.
• Legitimate error occurs when motor is overworked due to worn belt / deck, poor airflow, excessive use, debris
entrapment etc.
• The motor's internal thermal switch tripped, disabling the motor. The motor's thermal switch opens when the motor
temperature exceeds the switches trip point (thermal switch will close once motor cools down).
• This can be due to excessive user weight, restricted airflow, excessively hot environment. Clean around machine,
make sure it is not near a heat source.
• The motor thermal sensor system (wires / connectors) should also be checked. If the thermal switch measures open
when the motor is cool there is a problem in the wiring or the switch has failed.
• Replace Drive Motor
• Replace Motor Drive Board
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