Carrier NDK33BN0KB, Operation & Service Manual

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62-61753-21 7-31
Alarm
NO.
Steps ALARM / CAUSE CORRECTIVE ACTION
40 CHECK GLOW PLUGS

TRIGGER-ON: During engine startup glow plug amperage is less than 30 Amps, or greater than
16 Amps after 14 seconds of glow time (NOTE: In auto start, this can only occur when the Engine
Coolant Temperature is below 32°F (0°C) and the glow time is configured SHORT.)

UNIT CONTROL: Engine operation: alarm only. Standby operation: this alarm will not activate in
standby operation.

RESET CONDITION: Auto Reset if glow plug amperage is between 30 to 16 amps for at least
14 seconds during the glow cycle 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, the active
alarm should clear itself (refer to reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
1. Check Glow Plug Circuit
a. Inspect glow plug relay & socket No signs of discoloration from overheating
No corrosion
b. Use Component Test Mode to test
actual current draw of the circuit.
(Refer to Section 5.1.2.)
Component FET or board LED (refer to Table 5-1)
must be illuminated.
View current draw in Data List.
Refer to Section 2.12 for normal current values.
c. Check Non-Running Amps View Current Draw in Data List
Refer to Section 2.12.
d. Check Glow Plug circuit amperage Current Draw = Non-Running Amps + Glow Plug Amps
e. Check voltage to glow plugs
Must be 11 VDC or higher
2. Check Glow Plug Circuit Wiring
a. Inspect harness & control box
connector pins & terminals (See
wiring schematic)
No physical damage to harness.
No damaged or corroded pins
3. Check Glow Plugs
a. Check amp draw of each glow plug Refer to Section 2.12