Carrier NDK33BN0KB, Operation & Service Manual

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62-61753-21 7-89
Alarm
NO.
Steps ALARM / CAUSE CORRECTIVE ACTION
7.11 MICROPROCESSOR ALARMS
232 SETPOINT ERROR

TRIGGER-ON: There is an error in the set point that is stored in the microprocessor memory.

UNIT CONTROL: Unit Shutdown & Alarm.

RESET CONDITION: Auto Reset when a valid set point is entered, or alarm may be manually reset
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 (see 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 Set Point
a. Check set point setting. Must be between -30°C and +32°C (-22 and +89.6°F)
b. Enter new set point.
2 Reset Microprocessor
a. Place the SROS in the OFF posi-
tion for 30 seconds, then back to
START / RUN.
The microprocessor powers up OK and the latest set
point appears in the display.
b. Valid set point can not be entered. Replace microprocessor. Refer to Section 5.4
233 MODEL # ERROR

TRIGGER-ON: There is an error in the Model Number that is stored in the microprocessor memory

UNIT CONTROL: Unit Shutdown & Alarm

RESET CONDITION: Auto Reset only when a valid Model number is entered.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (see 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 Model Number
a. Check Model Number in
microprocessor.
Configure the unit for the correct model number. (Refer
to Section 5.1.1.)
2 Reset Microprocessor
a. Place the SROS in the OFF posi-
tion for 30 seconds, then back to
START / RUN.
Microprocessor powers up OK.
b. Check for valid Model number in
Data List.
Valid number is present.
Alarm is cleared.
c. Valid model number can not be
entered.
Replace microprocessor. Refer to Section 5.4