Carrier VECTOR 6500 Operation & Service Manual page 185

Alarm
Steps
NO.
77 EVAP MOTOR OVERHEATED - Continued
6 Check Evaporator Fan Motor
Disconnect power plug at motor
7 Check Motor Operation
Turn the unit ON
62-11389
Alarm/Cause
7−52
Corrective Action
Test IP circuit for continuity using ohmmeter
If open, remove and replace motor
If closed, then an intermittent IP circuit is suspect.
Check phase to phase and phase to ground for short
or open circuits. Refer to Section 2.11 for correct
electrical values.
If motor tests good, check the DC IP circuit to
microprocessor.
Check current on each phase (must be less than
shown on Section 2.11).
Check voltage on each phase (must be at within lim-
its shown in Section 2.11.)