Carrier VECTOR 6500 Operation & Service Manual page 242

Alarm
Steps
NO.
249 MICROPROCESSOR ERROR
•
TRIGGER–ON: Microprocessor Input Conversion Error.
•
UNIT CONTROL: Shutdown and alarm.
•
RESET CONDITION: Auto Reset when input conversions are valid, or Alarm may be manually
reset by turning the unit off, then back on again.
Follow the steps below until a problem is found. Once a repair or correction has been made, clear the alarm(s).
(See Note 1 page 7−2.) Operate the unit through the appropriate modes to see if any active alarm occurs.
Continue with the steps below as necessary.
1 Check Software Revision
Check microprocessor software revi-
sion.
2 Check Microprocessor
a. Check Temperature Sensor Data
b. Check for any Active Sensor
Alarms
3 Check Microprocessor & Unit Wiring
Check Wiring to Micro and at input
devices to the micro.
4 Reset Microprocessor
a. Place the Main Power switch in the
OFF position for 30 seconds, then
back to the desired position.
b. Alarm 249 remains active.
Alarm/Cause
7−109
Corrective Action
Upgrade to the latest revision of software.
Must be valid reading for RAT, SAT, AAT, etc.
Must all be cleared.
Must not be miss-wired to allow 12 VDC on any of
the sensor input circuits.
Microprocessor powers up OK
Download (if possible) and replace microprocessor.
Refer to Section 5.7.
62-11389