Carrier 58CVA Furnace Error Codes — Fault Code Diagnostic Guide

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.

Jump to Fix

Carrier 58CVA Error Code Reference

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 {#fix}

1. 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.
2. 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.
3. 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.
4. 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).
5. 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

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.

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