Carrier VECTOR 1550 Series - Page 139

62-61753-21
7-23
Alarm
NO.
Steps
ALARM / CAUSE
CORRECTIVE ACTION
31 FAILED TO START - AUTO MODE
 TRIGGER-ON: Engine has tried to start three times unsuccessfully in the auto start mode.
 UNIT CONTROL: Unit Shutdown & Alarm
 RESET CONDITION: Alarm may be manually reset via keypad or by turning the unit off, then back on
again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (Refer to Note 1 Page 7-1) Operate the unit through the appropriate modes to see if any active alarm
occurs. Continue with the steps below as necessary.
1
Check Fuel Level in Tank.
a. Check fuel gauge on tank.
Fill tank as needed.
2
Check For Alarms
a. Check for the following alarms:
130 Check engine RPM sensor
71 Check for Bad F2 or F3 Fuse
40 Check Glow Plugs
35 Check Starter Circuit.
Alarm conditions must be corrected and the alarm
cleared to continue.
3
Check Fuel Solenoid
b. Check Run Relay LED
LED 28 must be ON.
c. Inspect solenoid & connector pins
& terminals
No damage to solenoid
No damaged or corroded pins
d. Check voltage at the fuel solenoid
plug between pin A and ground
(running) or between pin B and
ground (cranking)
Energize circuit (refer to Note 2 Page 7-2). Voltage
should be approximately 12 VDC
e. Check for continuity at the fuel
solenoid plug between pin C and
ground (running)
Repair wiring.
f. Check resistance of solenoid
Refer to Section 2.12
g. Check operation of solenoid
Plunger must move in when energized
4
Check Fuel System
a. Check fuel system prime.
No air in fuel system.
b. Check fuel flow.
Unrestricted fuel flow through system.
5
Check Engine Air-intake System
a. Check air filter.
Replace if required.
b. Inspect air intake system.
Hoses & tubes in good condition.
No kinks or restrictions.
6
Check For Correct Engine Oil
a. Check for correct oil viscosity
(weight) for conditions.
Refer to Section 2.8.
Must be correct for ambient conditions.
7
Check Engine Exhaust System
a. Inspect the exhaust system.
Must be clear and unobstructed.
8
Check Engine
a. Check engine compression.
Refer to Section 2.8.