Carrier X4 7300 - 22102 Sensor Input Voltage High Inp1; 23100 No Comm from Micro to Outpbd1

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22102 SENSOR INPUT VOLTAGE HIGH INP1

NOTE

This alarm is an indication that there is a short in the DC current transformer wiring from another (nom-

inal 12 VDC) circuit into the transducer or CT sensor circuit.

• ACTIVATION: Voltage from main microprocessor to the sensors is greater than 5.5 VDC

• UNIT CONTROL: Alarm only.

• RESET CONDITION: Auto reset when sensor voltage is correct, alarm reset 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, clear the

alarm(s). (Refer to Note 1 in Notes Section, page 7-2.) Operate the unit through the appropriate modes to see if

any active alarm occurs. Continue with the steps below as necessary.

CORRECTIVE ACTIONS:

1. Check Transducer Wiring

Check wires to sensors for short.

For CSP, check wiring from 2MM−20, 2MM−30 and 2MM−9.

For EVOP, check wiring from 2MM−28, SP−7 and 2MM−17.

For CDP, check wiring from 2MM−21, SP−7 and 2MM−10.

2. Check CT Wiring

Check wires to sensor for short from another circuit. Check wiring from 2MM−29, 2MM−12 and 2MM−23

to PCM.

3. Replace Main Microprocessor

Download data and replace main microprocessor. For complete Main Microprocessor Module replace-

ment instructions refer to Section 5.5.2.

23100 NO COMM FROM MICRO TO OUTPBD1

• ACTIVATION: Main microprocessor cannot communicate internally.

• UNIT CONTROL: Shutdown all modules except the display and alarm. (The alarm will only display if the dis-

play module is communicating.) Main microprocessor status LED will illuminate steady green (not pulsing).

• RESET CONDITION: Auto reset when internal communication is restored, alarm reset or alarm may be

manually reset by turning the unit off, then back on again.