Carrier VECTOR 1800 MT - Page 234

62-11039
7-103
Alarm
NO.
Steps ALARM / CAUSE CORRECTIVE ACTION
P199 C2 CHECK RETURN AIR SENSOR
• TRIGGER–ON: Compartment 2 Return Air Sensor is not within the maximum range of --53°F to +158°F
(--47°Cto+70°C)
•
U
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O
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R
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P
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• UNIT CONTRO
L
: Engine and standby operation: pre--trip will
f
ail and display “PRE--TRIP F
A
I
L
A
ND
COMPLETED”.
• RESET CONDITION: Auto Reset if pre--trip mode is started again, 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, clear the
alarm(s). (See Note 1) Operate the unit through the appropriate modes to see if any active alarm occurs. Continue
with the steps below as necessary.
1. Check Return Air Sensor
a. Inspect Return Air Sensor & connector No physical damage to harness.
No moisture, damaged or corroded pins
1MP Plug is connected tightly to microprocessor. No wires
h
d
b
k
t
h
h
l
b. Check Return Air Sensor resistance
(See Note 4)
g
g
y
p
are pushed back through plug.
10,000 Ohms @ 77°F(25°C) [See manual for complete
table of temperatures and resistance values.]
2. Check Return Air Sensor Wiring
a. Inspect harness & control box
connector pins & terminals (See
wiring schematic)
No physical damage to harness.
No damaged or corroded pins