7
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92
62-11389
Alarm
NO.
Steps
Alarm/Cause
Corrective Action
P189 CHECK EVAPORATOR FAN MOTOR - Continued
460
VAC
CIR-
CUIT
5
Check Amp Draw of 1EVCON Evap Fan Motor Circuit
a. With the unit running in either HEAT
or COOL use a clamp on ammeter
to check the current draw of all 3
legs.
Must be within range shown in Section 2.11 for all
three legs.
b. Check fuses for evaporator fan mo-
tor.
F26, F27, and F28 must not be blown.
c. Check voltage at 1EVCON con-
tacts.
Must be within range shown in Section 2.11 for
L1-L2, L1-L3, and L2-L3.
Must be within range shown in Section 2.11 for
T1-T2, T1-T3, and T2-T3.
6
Check Evaporator Fan Motor
a. With the unit off, visually check fan
motor and blower wheel.
No visual physical damage.
No blockage to blower wheels.
Blower wheels spin freely.
Remove and replace if required.
b. With the unit off, check the resist-
ance of the evaporator fan motor
windings.
See Section 2.11 for correct resistance.
Resistance (Ohms) must be in range.
No continuity from any high voltage lead to ground.
7
Check Evaporator Fan Motor Connections
Inspect high voltage fan motor con-
nections at evaporator.
No corrosion, water damage or burning / discolor-
ation.
Remove, repair, or replace if required.
8
Verify Accuracy of AC Current Sensor
Put microprocessor in PC Mode. Re-
fer to Section 5.3 page 5
−
3.
Must have 0 AC1 Amps and 0 AC2 Amps in Unit
Data.
