Carrier VECTOR 6500 Operation & Service Manual page 189

Alarm
Steps
NO.
89 CHECK REMOTE AUTO LIGHT (Light Bar)
•
TRIGGER–ON: The normal operation output circuit (green "Status OK" light) to the light bar is
shorted. (The light bar output from the microprocessor [3MP32] is negative, so the circuit will not be
shorted to ground, but is shorted either within the light bar itself, or to a positive wire.)
•
UNIT CONTROL: Engine and Standby Operation: alarm only.
•
RESET CONDITION: Auto Reset when Auto light current (amp) draw is normal, 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 2-Light Bar Wiring
a. Inspect light bar & connector.
b. Inspect harness & control box
connector pins & terminals. (See
wiring schematic Section 10.)
2
Check 2-Light Bar
Check operation of 2-Light Bar
91 CHECK 1HTCON1 RELAY COIL
•
TRIGGER–ON: Heater Contactor 1 (1HTCON1) circuit is shorted. (The contactor output from the
microprocessor (4MP13) is negative, so the circuit will not be shorted to ground, but is shorted
either within the contactor coil itself, or to a positive wire.)
•
UNIT CONTROL: Engine and Standby Operation: alarm only.
•
RESET CONDITION: Auto Reset 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 1HTCON1
a. Inspect heater contactor relay coil
and connector.
b. Check contactor coil resistance.
c. Check amp draw of coil.
2 Check 1HTCON1 Current Draw
Use Component Test Mode to test
actual current draw of the circuit.
(Refer to Section 5.2.2.)
3 Check 1HTCON1 Wiring
Inspect harness & control box con-
nector pins & terminals. (See wiring
schematic Section 10.)
62-11389
Alarm/Cause
7−56
Corrective Action
No damaged to light bar
No damage, moisture, or corrosion in connector.
No physical damage to harness.
No damage, moisture, or corrosion in connectors.
Refer to Section 8.9.3 for information on testing the
2-Light Bar.
No damage to coil.
No damage, moisture, or corrosion in connector.
Refer to Section 2.12 for correct electrical values.
Cannot be opened (infinite ohms), shorted (Zero
Ohms) or shorted to ground.
Refer to Section 2.12 for correct electrical values.
Use ammeter.
Refer to Section 2.12 for correct electrical values.
View current draw in Data List.
No physical damage to harness.
No damage, moisture, or corrosion in connectors.