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Carrier 58SB0 Comfort™ 80 Gas Furnace troubleshooting and error codes

Use this table to identify what the visible code may mean and what information to share when scheduling service. Keep checks simple and visible; do not open electrical, refrigerant, gas, or sealed equipment compartments.

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Error-code table

Search codes for 58SB0 Comfort™ 80 Gas Furnace

Code Meaning System area Safe first step Action
11 No previous code Furnace control status Record the displayed code or LED pattern, confirm thermostat or controller demand, check visible airflow and outdoor-area conditions, and schedule service if the condition remains. View details
12 Blower on after power up Indoor blower / startup Record the displayed code or LED pattern, confirm thermostat or controller demand, check visible airflow and outdoor-area conditions, and schedule service if the condition remains. View details
13 Limit circuit lockout Limit circuit Record the displayed code or LED pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
14 Ignition lockout Ignition Record the displayed code or LED pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
21 Gas heating lockout Gas heat control Record the displayed code or LED pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
22 Abnormal flame-proving signal Flame sensing Record the displayed code or LED pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
23 Pressure switch did not open Pressure switch Record the displayed code or LED pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
24 Secondary voltage fuse is open Low-voltage control circuit Record the displayed code or LED pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
31 Pressure switch did not close or reopened Pressure switch Record the displayed code or LED pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
33 Limit circuit fault Limit circuit Record the displayed code or LED pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
34 Ignition proving failure Ignition / flame proving Record the displayed code or LED pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details
45 Control circuitry lockout Furnace control board Record the displayed code or LED pattern, avoid repeated reset attempts, and schedule GreenFlow service. View details

Safety note

What is safe to check before service

These pages are meant to help document the issue, not replace diagnosis. GreenFlow should handle pressure-switch, electrical, refrigerant, lockout, recurring, and warranty-related conditions.

Safe visible checks

  • Thermostat display and settings
  • Filter condition and return-air path
  • Visible outdoor-unit obstruction
  • Photos of the code, unit, and nameplate

Stop and call

  • Repeated lockouts or recurring faults
  • Pressure-switch or sensor faults
  • Electrical odor, unusual noise, or ice buildup
  • Any sealed cabinet, refrigerant, gas, or warranty issue

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Jahangir R.

They were very organized to communicate and be on time to come to look at my air condition to fix it.

Anna F.

They showed up within an hour of me making the call on a Sunday. They fixed our system and taught us how to replace the fuse in the future. We would definitely call again.

Dev W.

I had a breakdown of my cooling system and Hanna at Green Flow responded to my request right away. They scheduled me same day. The team at Green Flow was easy to communicate with over phone and text. They kept me updated on delays on arrival of the...

Randy J.

Thanks to Andrey for an amazingly quick response to my request for a service call. He diagnosed and fixed my issue within 24 hours of my asking for help. Excellent service. Thanks.

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