Carrier VECTOR 1550 Series Operation & Service Manual page 186

Alarm
Steps
NO.
133 CHECK REMOTE TEMPERATURE SENSOR 1 (REMSN1)
134 CHECK REMOTE TEMPERATURE SENSOR 2 (REMSN2)
135 CHECK REMOTE TEMPERATURE SENSOR 3 (REMSN3)

TRIGGER-ON: Sensor is not within the range of -47to +70°C (-53 to +158°F).

UNIT CONTROL: Engine and standby operation: Alarm only.

RESET CONDITION: Auto Reset when Remote Temperature Sensor 1 is in range 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, 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 Sensor Wiring
a. Inspect sensor & connector pins &
terminals. (See wiring schematic
Section 10.)
b. Energize sensor circuit.
c. Check for voltage at the sensor
plug between pins A (+) and B
(ground).
d. Locate and inspect 10-way con-
nector for optional sensors and
switches.
2 Check Circuits With Another Sensor
a. Substitute known good sensor and
clear alarm. Start unit and run for
30 seconds.
b. Check to see if alarm re-occurs.
NOTE: If new sensor is not available, the sensor may be configured OFF temporarily. Refer to Section 5.1.1 -
Configurations.)
62-61753-21
ALARM / CAUSE CORRECTIVE ACTION
No physical damage to sensor.
No damaged or corroded pins in plug.
Refer to Note 2 Page 7-2.
Voltage should be approximately 12 VDC.
If OK, go to step e. If not, continue with this step.
Connector must have cap on,
No corrosion or moisture inside connector.
Check for power between terminals A (+) & B
(Ground). Voltage should be approximately 12 VDC.
Repair wiring as required.
Alarm should not come on. (Install new sensor if nec-
essary)
7-70