Bryant Furnace Error Codes and Troubleshooting Guide

Bryant Furnace Error Codes provide diagnostic insight into common operating problems and help homeowners or technicians identify faults quickly. This guide explains code meanings, probable causes, basic fixes, and when to call a professional. Use the code chart below for quick lookup.

Code	Indicator	Typical Meaning
1 Flash	Short Blink	Normal Idle/Standby
2 Flashes	Two Blinks	Normal Warming/Service Mode
3 Flashes	Continuous	Limit Or Rollout Switch Open
4 Flashes	Continuous	Pressure Switch Open Or Shorted
5 Flashes	Continuous	Flame Failure Or Flame Sensing Issue
6 Flashes	Continuous	Gas Valve Or Inducer Problem
7 Flashes	Continuous	Low Supply Voltage Or Control Fault
8 Flashes	Continuous	Internal Control Board Failure
9 Flashes	Continuous	Ignition Lockout / Repeated Failures

How Bryant Furnace Error Codes Work

Bryant furnaces use an LED or control board display to flash error codes. Each code corresponds to a specific fault detected by safety devices, sensors, or the control board logic. Codes speed diagnosis by indicating the subsystem affected, such as ignition, flame sensing, pressure, or safety limits.

Most modern Bryant units follow a flash-count format where the number of blinks repeats after a pause. Some systems use alphanumeric displays or a smart control with an app or thermostat integration. Regardless of interface, interpreting the code is the first step in troubleshooting.

Common Bryant Furnace Error Codes And Meanings

3 Flashes — Limit Or Rollout Switch Open

This code means a high-temperature limit or rollout switch has opened, interrupting the burner. Causes include restricted airflow, dirty filters, blocked vents, or flame rollout due to combustion issues. Check airflow and venting first.

4 Flashes — Pressure Switch Open Or Shorted

A malfunctioning pressure switch or blocked inducer airflow triggers this code. Typical causes are a clogged condensate drain, restricted vent pipe, failed inducer motor, or damaged pressure tubing. Inspect the inducer and tubing for obstructions or damage.

5 Flashes — Flame Failure Or Sensing Problem

This error indicates the control did not detect a stable flame after the ignition sequence. Causes include dirty flame sensor, faulty ignitor, gas valve not opening, or wiring issues. Cleaning the flame sensor often resolves the issue; replacement may be necessary if the sensor or ignitor is degraded.

6 Flashes — Gas Valve Or Inducer Problem

The control detected improper operation of the gas valve or inducer. Possible reasons include a failing gas valve, weak inducer motor, or insufficient gas pressure. Verify gas supply, listen for the inducer, and check voltage to motors and valves.

7 Flashes — Low Supply Voltage Or Control Fault

Low line voltage, loose connections, or internal electronics malfunction result in this code. Measure incoming voltage at the furnace and inspect the transformer and connections. Voltage issues must be corrected promptly to avoid damage.

8 Flashes — Control Board Failure

An internal control board fault or memory error is indicated. Symptoms can include intermittent operation, inability to lock out, or inconsistent diagnostics. Board replacement or manufacturer service is often required.

9 Flashes — Ignition Lockout

This code appears after multiple failed ignition attempts within a cycle, causing the control to lock out for safety. Causes are related to ignition components, flame sensing, or gas supply. Resetting the unit may clear transient lockouts, but persistent occurrences warrant deeper troubleshooting.

Step-By-Step Basic Troubleshooting

These steps help address many common Bryant Furnace Error Codes safely. Always turn off power before performing inspections that expose electrical components.

1. Check Power And Thermostat: Ensure the furnace has power at the breaker and the thermostat calls for heat. Replace thermostat batteries and confirm correct thermostat settings.
2. Inspect Air Filter: A dirty or restricted filter causes overheating and limit trips. Replace or clean filters regularly.
3. Examine Vents And Return Air: Blocked or closed supply/return vents reduce airflow and cause rollout or limit switches to open. Clear obstructions and check for closed dampers.
4. Look For Error Code Pattern: Record the LED flash count and cycle pattern. Use the Bryant code chart to identify the subsystem.
5. Inspect Flame Sensor: Remove and clean the flame sensor with steel wool or emery cloth. Reinstall and test for improved flame detection.
6. Verify Pressure Switch Tubing: Check for disconnected or collapsed tubing between the inducer and pressure switch. Replace brittle tubing.
7. Check Inducer Operation: With power applied and call for heat, observe the inducer motor. Listen for abnormal noise or failure to run.
8. Confirm Gas Supply: Ensure gas is on to the furnace. If another gas appliance works, supply is likely fine; otherwise contact the gas company or a technician.

When To Call A Professional

Some errors require qualified HVAC service. Call a licensed technician when: gas valve, control board, inducer motor, or internal combustion components need inspection or replacement. Also seek help for suspected gas leaks, persistent ignition lockouts, or codes that repeat after basic checks.

Safety Precautions And Best Practices

Working on a gas furnace carries risks. Follow these precautions: shut power at the breaker before opening panels, turn off gas if a leak is suspected, avoid touching hot surfaces, and do not attempt complex electrical diagnostics without training. Carbon monoxide concerns require immediate attention if occupants feel unwell or detectors alarm.

Preventive Maintenance To Reduce Error Codes

Regular maintenance lowers the chance of recurring codes. Recommended tasks include annual professional inspection, biannual filter changes, keeping vents and returns clear, and cleaning condensate drains and flame sensors. Seasonal checks before heavy-use months can catch issues early.

Reading More Advanced Diagnostics

Some Bryant systems provide enhanced diagnostics via a control board LED combined with status pins or a service menu on the thermostat. Technicians can use these to view lockout counts, runtime hours, and component voltages. For advanced fault trees, consult the unit-specific service manual or Bryant technical resources.

Parts That Commonly Cause Error Codes

Component	Symptoms	Typical Replacement Interval/Notes
Flame Sensor	Flame failure, 5 flashes	Clean regularly; replace if corroded
Ignitor	No ignition; repeated lockouts	5–10 years depending on cycles
Pressure Switch	Inducer/pressure errors, 4 flashes	Replace if stuck or fails continuity
Inducer Motor	Slow start, no airflow	8–15 years; noisy operation indicates wear
Control Board	Random faults, 8 flashes	Replace when diagnostics point to board failure

How To Find The Correct Error Code Chart For A Specific Bryant Model

Model-specific manuals provide the exact code definitions and LED patterns. Locate the furnace model number on the unit data plate, then download the service manual from Bryant’s official website or authorized distributors. Using the exact manual avoids misinterpretation.

Cost Considerations For Repairs

Basic repairs such as cleaning a sensor or replacing a filter are low-cost. Component replacements vary: ignitors and sensors are typically inexpensive, while inducer motors, gas valves, or control boards are more costly and include labor. Always request an itemized estimate and parts warranty from the service provider.

Useful Tools And Multimeter Checks

Technicians use a multimeter to check voltages, continuity, and sensor outputs. Useful homeowner tools include a flashlight, screwdriver set, and flexible brush for cleaning. For electrical checks, a licensed technician should perform voltage and current measurements for safety and accuracy.

Common Misdiagnoses To Avoid

• Mistaking thermostat failure for furnace error — verify thermostat operation first.
• Replacing the control board prematurely — rule out peripheral component failures first.
• Overlooking simple airflow issues — dirty filters and blocked vents are frequent causes of limit and rollout codes.

Resources And References

Consult Bryant’s official technical documents, manufacturer service bulletins, and the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) for standards. Local HVAC professionals can provide model-specific diagnostics and safe repairs.

Key Takeaway: Bryant Furnace Error Codes are diagnostic tools that point to subsystem faults. Systematic checks of airflow, flame sensing, pressure, and voltage often resolve common codes, while gas, inducer, or control board failures require professional attention.