Run capacitor
Common no-start and weak-compressor failure point. Match the microfarad and voltage rating.
Carrier 58CVA Furnace Error Codes — What They Mean
The Carrier 58CVA is a two-stage variable-speed gas furnace delivering 80% AFUE efficiency. It uses an ECM blower motor for variable airflow and a two-stage gas valve for improved comfort and dehumidification. The 58CVA communicates faults through a two-digit LED display on the control board — a more informative system than single-LED flash codes. Each code is a two-digit number that identifies both the fault category and specific condition.
Carrier 58CVA Error Code Reference
| Code | Fault |
|---|---|
| 11 | No ignition — failed to light |
| 12 | Blower on after delay (not a fault — status) |
| 13 | Limit device lockout — exceeded 3 limit trips |
| 14 | Ignition lockout — exceeded 3 ignition failures |
| 21 | Gas heating lockout — control reset required |
| 22 | Abnormal flame sense current |
| 23 | Pressure switch stuck open |
| 24 | Secondary voltage fuse blown |
| 25 | Modulating gas valve fault |
| 31 | Pressure switch stuck closed |
| 32 | Pressure switch open during run |
| 33 | Limit circuit open |
| 34 | Igniter circuit open |
| 41 | Blower motor fault |
| 42 | Inducer motor fault |
| 43 | Condensate system fault (if equipped) |
| 44 | Flame sensed after gas valve closed |
| 45 | Control board fault |
| 46 | Incorrect line voltage (out of range) |
| 47 | Low-stage pressure switch stuck open |
Common Causes by Code
- Code 13 — Limit lockout — The 58CVA high-limit switch is tripping due to overheating. Most common cause: dirty air filter restricting airflow through the heat exchanger. Second cause: failed ECM blower motor running below rated speed.
- Code 14 — Ignition lockout — The furnace attempted to ignite three times and failed. Check the hot surface igniter (HSI) — silicon nitride igniter glow time should produce a visible orange glow within 17 seconds. Also check gas supply pressure at the manifold (should be 3.5” WC for natural gas at full fire).
- Code 22 — Abnormal flame sense — The flame sensor rod produces a DC microamp signal (1.5–4 µA normal). Below 1 µA causes this code. Clean the sensor with steel wool. A cracked flame sensor rod or an open circuit in the sensor wire causes complete failure.
- Code 33 — Limit circuit open — The high-limit or roll-out switch is open. Check the roll-out switch first — it’s a manual-reset device mounted at the burner box and trips if flames roll out (blocked heat exchanger or gas pressure too high).
- Code 41 — Blower motor fault — ECM motor fault. Check motor connector at both the motor and board. ECM motors communicate with the board — a fault in the motor or communication circuit triggers this code.
- Code 42 — Inducer motor fault — The inducer motor failed to reach operating speed. Check for blocked flue, failed inducer capacitor (on PSC-type inductors), or a seized inducer bearing.
Step-by-Step Fix
- Read the code — The 58CVA board displays the fault code as two digits on the LED display. If the board has a fault history, it cycles through recent codes. Record all codes before clearing.
- For Code 13/33 (limit) — Replace the air filter first. Then check return air temperature — should not exceed 85°F. Measure static pressure across the filter (should be less than 0.1” WC). Check blower motor RPM if a tachometer is available.
- For Code 14 (ignition lockout) — Confirm gas supply is on at the shutoff valve upstream of the furnace. Measure gas pressure at the manifold test port. Inspect the igniter — a cracked igniter glows unevenly or fails to reach temperature.
- For Code 22 (flame sense) — Remove the flame sensor wire. Clean the sensor rod with fine steel wool. Reinstall and measure microamp signal with a meter set to DC microamps (probe in series with the flame sensor wire).
- For Code 41 (blower) — Check the ECM motor hall-effect connector (5-pin) for corrosion. Measure 120VAC supply to the motor. Spin the blower wheel by hand — if it turns freely but the motor won’t run, the motor module may have failed.
Parts Often Needed
| Part | Notes |
|---|---|
| Hot surface igniter | Silicon nitride; handle carefully, avoid touching ceramic |
| Flame sensor | Clean first; replace if cracked or reading <0.5 µA |
| ECM blower motor | Verify correct motor model; programmed to unit |
| Inducer motor | Match frame size and speed rating |
| High-limit switch | L170°F or L200°F depending on unit config |
| Pressure switch | Check tubing for blockage before replacing |
Technician Tips
Carrier uses different diagnostic systems across furnaces, heat pumps, chillers, mini-splits, VRF equipment, rooftop units, and communicating controls. Confirm the full model number and whether the fault came from the indoor board, outdoor board, thermostat, or equipment controller before matching it to a repair path.
Start with power, wiring, airflow or water-flow, sensor, condensate, and safety-circuit checks before ordering control boards. If the same code returns after one reset and the basic cause is not obvious, test the named circuit instead of repeatedly cycling the equipment.
Common replacement parts for Carrier systems:
- Carrier flame sensor (part #HH18ZA641)
- Limit switch kit (part #HH18HA600)
- Pressure switch (part #HH18HA719)
Need Replacement Parts?
Before ordering, match the furnace part to the model number, electrical rating, and failure symptom. Check current prices on Amazon - prices and availability change frequently.
When to Call a Pro
The 58CVA’s two-stage gas valve and ECM motor require familiarity with Carrier’s variable-speed control logic to diagnose correctly. If Code 45 (control board fault) appears, contact a Carrier authorized dealer — board replacement on a variable-speed furnace requires configuration matching the ECM motor and gas valve parameters.