Carrier VECTOR 1800 MT - Page 251

7-120
62-11039
Alarm
NO.
Steps ALARM / CAUSE CORRECTIVE ACTION
245 MICRO SW REV ERROR
• TRIGGER–ON: There is an error in the Microprocessor Revision Number that is stored in the
Microprocessor memory.
p
y
• UNIT CONTROL: Alarm only
• RESET CONDITION: 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 (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 Microprocessor Software Revision
a. Check Microprocessor Software
Revision
Willbea6digitnumber
2. Reset microprocessor
a. Turn RS off for 30 seconds, then turn
back on.
Microprocessor powers up OK
V
a
l
i
d
n
u
m
b
e
r
i
s
p
r
e
s
e
n
t
b. Check for valid Configurations in Data
List.
V
a
l
i
d
num
b
er
i
s presen
t
.
Alarm is cleared
R
l
i
c. Valid Configurations can not be
entered.
Replace microprocessor
246 EEPROM WRITE FAILURE
• TRIGGER–ON: here is an error in the ability to write information to be stored in the memory.
•
U
N
I
T
C
O
N
T
R
O
L
:
A
l
a
r
m
o
n
l
y
• UNIT CONTRO
L
:
A
larm only
• RESET CONDITION: 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 (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 Microprocessor
a. Check Setpoint setting
b.Enter new Setpoint
Must be between --22°F to +89.6°F(--30°Cto+32°C)
Must be between --22°F to +89.6°F(--30°Cto+32°C)
2. Reset Microprocessor
a. Turn main switch off for 30 seconds,
t
h
e
n
t
u
r
n
o
n
.
Microprocessor powers up OK
t
h
e
n
t
u
r
n
o
n
.
b. Alarm 246 remains active.
Replace microprocessor