Carrier 58VCA - Manual (Page 8)

When power is turned ON at the main disconnect, a microproces­
sor self-test sequence will be completed in approximately 20 sec.
During this period the GRN LED will light for 12 sec, followed by
lighting of the YEL and GRN LED’s for 1 sec. After this period,
the unit will operate if a thermostat signal is initiated.
Table 1—Fault Code Descriptions
CODE DESCRIPTION
11 No faults in history display
12 Blower calibration lockout
13 High limit lockout
14 Pilot proving lockout
21 Invalid model selection
22 Set-up error
23 Cooling capacity error
24 Illegal thermostat input
31 High-pressure switch fault
32 Low-pressure switch fault
33 High limit fault
34 Pilot proving fault
41 Blower outside valid speed range
42 Inducer outside valid speed range
43 Rpm ratio out of range
44 Blower calibration fault
Fault Code Descriptions:
Code 11 — No fault in recent history display.
Indicates no faults have occurred within last 5 cycles.
To read recent fault history, put setup switch SW-1 in the ON
position.
To clear recent fault history, put setup switch SW-1 in the ON
position and jumper R, W, and Y simultaneously until a code 11 is
flashed.
Return setup switch SW-1 to the OFF position when complete.
Code 12 —Blower calibration lockout.
Indicates rpm calculated for low heat is less than 300 rpm or
greater than 1300 rpm on 2 successive attempts.
Check the following before referring to the trouble-shooting guide;
1. Excessive high- or low-static pressure could be caused by
dirty filters or undersized ductwork.
Code 13 —High-limit lockout.
Indicates the occurrence of 10 successive limit trips during high
fire or 3 successive limit trips during low fire.
Check the following before referring to the trouble-shooting guide:
1. Improper or misaligned limit and/or limit shield.
2. Improper high- or low-gas input adjustment.
3. Stuck high-fire solenoid in gas valve.
Code 14—Pilot-proving lockout.
Indicates pilot failed to prove in 5 minutes on 2 successive cycles.
It can also indicate the pilot was proven at the start of 2 successive
cycles.
Check the following before referring to the trouble-shooting guide:
1. Gas valve is turned OFF.
2. Main shutoff valve is turned OFF.
3. Wet pilot.
4. Restricted pilot orifice.
5. Open pilot circuit.
6. No spark at pilot.
7. Stuck pilot solenoid in gas valve.
Code 21 — Invalid model selection.
Indicates personality connector is missing or incorrect.
See wiring diagram for correct connector jumper location.
Code 22 —Setup error.
Indicates setup switch SW-1, SW-2, or SW-3 is positioned
improperly.
The following combinations will cause the fault:
1. Thermostat call with SW-1 ON.
2. SW-2 and SW-3 ON together.
3. SW-1 and SW-2 ON together.
4. SW-1 and SW-3 ON together.
5. SW-1, SW-2, and SW-3 ON together.
Code 23 — Cooling capacity error.
Indicates improper A/C switch setting.
The 060-size furnace can deliver 1-1/2 to 3 tons of cooling airflow.
The 080-size furnace can deliver 1-1/2 to 3-1/2 tons of cooling
airflow. The 100-size furnace can deliver 2 to 5 tons of cooling
airflow.
If fault is flashing, unit will operate, but it will default to the
closest allowable airflow.
Code 24 — Illegal thermostat input.
Indicates thermostat terminals Y and W are both energized; unit
will default to cooling operation.
Code 31 —High-pressure switch fault.
Indicates high-pressure switch is closed at “call for heat,” is
closed in low-fire operation, fails to close after “call for heat,” or
opens in high-fire operation.
Check the following before referring to the trouble-shooting guide:
1. Plugged condensate drain.
2. Water in vent piping (possibly sagging piping).
3. Pressure switch wiring or tubing connections incorrect.
4. Failed or out-of-calibration pressure switches.
5. Pilot flame adjustment.
6. Failed or out-of-calibration pilot.
Code 32 — Low-pressure switch fault.
Indicates low-pressure switch is closed at “call for heat,” fails to
close after “call for heat,” or opens during operation.
Check the following before referring to the trouble-shooting guide;
1. Plugged condensate drain.
2. Water in vent piping (possibly sagging piping).
3. Pressure switch wiring or tubing connections inconect.
4. Failed or out-of-calibration pressure switches.
Code 33 — High-limit fault.
Indicates the high limit is open or the unit is operating in high- heat
only mode due to 2 successive low-fire limit trips.
Check the following before referring to the trouble-shooting guide;
1. Improper or misaligned limit and/or limit shield.
2. Improper low-gas input adjustment.
3. Stuck high-fire solenoid in gas valve.
Code 34—Pilot-proving fault.
Indicates pilot failed to prove within 5 minutes, the pilot opened
during the cycle, or the pilot was proven at the start of the cycle.
If this fault does not progress to a fault code 14, check the
following. Otherwise, refer to fault code 14: