Carrier VECTOR 1800 MT - Page 231

7-100
62-11039
Alarm
NO.
Steps ALARM / CAUSE CORRECTIVE ACTION
P189 CHECK EVAPORATOR FAN MOTOR (Continued)
5. Check Evaporator High Temperature Switch (2EVHTS)
a. Inspect for open 2EVHTS per wiring
diagram
If open, replace switch as required
6. Check Amp Draw of 1EVCON Heater Circuit
a. Use a clamp on ammeter to check the
current draw of all 3 legs.
Must be within range shown in Section 2.13 for all three
legs.
7. Check Heater Elements
a. Check heater elements No visual physical damage
No blockage due to debris
Remove and replace if required
460
8. Check Heater Element Plugs And Connections
4
6
0
VAC
CIR-
a. Disconnect heater element plug Heater resistance per Section 2.13
Remove and replace heaters if required
C
I
R
CUIT
b. Inspect plugs, plug seal and
connectors.
No corrosion, water damage or burning/discoloration
Remove and replace if required
9. Verify Accuracy of AC Current Sensor
a. Disconnect heater element plug Heater resistance per Section 2.13
Remove and replace heaters if required
b. Inspect plugs, plug seal and
connectors.
No corrosion, water damage or burning/discoloration
Remove and replace if required
10. Check Heater Wiring
a. Use a clamp on ammeter to check the
total current draw
Compare to Unit Data
b. If no fault was found in previous tests Remove and replace contactor