Carrier VECTOR 6500 - Speed Control System Diagnostics; Table 9−1 ENSCU LED Fault Chart

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9.5 Speed Control System Diagnostics
Table 9−1 ENSCU LED Fault Chart
Fault LED flash code Diagnostic tree
1 Engine Over Speed: more than 2,530 RPM One Long–One Short Figure 9−1
2 No signal from ENSSN for 2 seconds after RPM
is greater than 1,000 RPM for 10 seconds, OR
for 5 seconds while engine cranking (no voltage
at ENSCU pin 18).
Two Long–One Short Figure 9−2
3 Fuel/speed actuator (FSA) wiring disconnected
or open circuit. Coil Resistance Spec: 2.8 ohm
+/- 10%.
Two Long–Three Short Figure 9−3
4 ENSCU supply voltage is greater than 26V. Two Long–Seven Short Figure 9−4