Carrier VECTOR 1550 Series - EVAP MOTOR OVERHEATED (Continued)

62-61753-21
7-48
Alarm
NO.
Steps
ALARM / CAUSE
CORRECTIVE ACTION
77 EVAP MOTOR OVERHEATED (Continued)
6
Check Evaporator Fan Motor
a. Disconnect power plug at motor
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.
If motor tests good, check the DC IP circuit to micro-
processor.
7
Check Motor Operation
a. Turn the unit ON
Check current on each phase (must be less than
shown on Section 2.11).
Check voltage on each phase (must be at within limits
shown in Section 2.11.)