Carrier NDK33BN0KB, Operation & Service Manual

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62-61753-21 7-10
Alarm
NO.
Steps ALARM / CAUSE CORRECTIVE ACTION
16 BATTERY VOLTAGE TOO LOW

TRIGGER-ON: Voltage at the microprocessor is less than 10 VDC (except when the engine starter is
engaged.)

UNIT CONTROL: Unit Shutdown & Alarm. Alarm only, if activated while starting unit.

RESET CONDITION: Auto Reset after 15 minutes when the voltage at the microprocessor is between
11 - 14 VDC, 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 For Alarm 51
a. Check for "Alternator Not Charging
Alarm". ( Note : The A51 name is
carried over from unit models with
alternators. For the Vector Model,
Alarm 51 indicates that the solid
state battery charger is not per-
forming correctly.
Alarm conditions must be corrected and the alarm
cleared to continue.
2 Check Battery Voltage
a. Inspect battery cable ends and
posts.
Must be clean and tight.
b. Test voltage at battery with unit off. Must be above 11 VDC.
c. Test voltage at battery with unit
running.
Must be above 11 VDC.
d. Test specific gravity of battery. (Check for battery specifications.)
e. Perform load test on battery. (Fol-
low battery manufacturer’s proce-
dure.)
(Check for battery specifications.)
3
Check Voltage At Microprocessor
a. Check voltage reading at micro-
processor input
(MPQC1+ to MPQC2-).
Must be above 11 VDC.
b. Check voltage reading on micro-
processor display.
Must be within 0.5 VDC of reading obtained in 3a
(above.)