Carrier VECTOR 1800 MT, Operation & Service Manual

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62-11039 7-21
Alarm
NO.
Steps ALARM / CAUSE CORRECTIVE ACTION
31 FAILED TO START -- AUTO MODE
• TRIGGER–ON: In engine mode, engine has tried to start 3 times unsuccessfully in the auto start mode.
• UNIT CONTROL: Engine operation:engine and unit shutdown and alarm. Standby operation: this alarm UNIT CONTROL: Engine operation:engine and unit shutdown and alarm. Standby operation: this alarm
will not activate in standby operation.
•
RESET CONDITION: Change unit to standby operation or 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). (See Note 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:
71 Check for Bad F2 or F3 Fuse alarm
40 Check Glow Plugs alarm
35 Check Starter Circuit alarm
Alarm conditions must be corrected and the alarm cleared
to continue
3. Check Fuel Solenoid
a.Check run relay. Unit in component test mode -- run relay ON.
b. Check Run Relay LED Must be ON.
c. Check voltage to fuel solenoid 12 VDC between FSC--C (ground) & FSH--A (hold)
with engine starter energized
12 VDC between FSC--C (ground) & FSP--B (pick)
d. Inspect solenoid & connector pins &
terminals
No damage to solenoid
No damaged or corroded pins
e. Inspect harness & control box
connector pins & terminals (See wiring
schematic)
No physical damage to harness.
No damaged or corroded pins
f. Check resistance of solenoid Refer to Section 2.14
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
c. Check voltage to glow plugs Glow Plug switch ON, Manual Start Mode
More than 11 VDC
5. Check Engine Air–intake System
a. Check air filter indicator Flag must not be visible.
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 2.9
Must be correct for ambient conditions
7. Check Engine Exhaust System
a. Inspect the exhaust system Must be clear and un--obstructed
8. Check Engine
a. Check engine compression Refer to Section 2.9
9. Check RPM Sensor
a. Check sensor See Section 8.6.3