Bryant Furnace Troubleshooting - Error Codes

Bryant Furnace Troubleshooting – Error Codes

Modern furnaces come with sophisticated mechanisms that ensure both accurate and reliable performance. New models utilize flashing LED lights to show error codes that help you identify your furnace’s problem when it’s not correctly running. The short flashes will present the first digit of the two-digit code, whereas the long moments will inform the second digit.

Bryant furnaces also come with flashing LED lights to give you information about the error codes. We’ve listed the most common Bryant furnace troubleshooting/error/fault codes so that you know where to begin next time your Bryant furnace isn’t running correctly.

Bryant furnace error code 12 and 44

In this case, the blower calibration may have developed a problem, and you should address it right away.

Bryant furnace error code 13

When your furnace displays error code 13, the limit switch is tripping due to various problems. Typically, your Bryant furnace will auto-reset after 3 hours.

Bryant furnace error code 14

Error code 14 signals problems with ignition. It will take three hours until the control will reset automatically.

Bryant furnace code 34

Again, some ignition issues are causing improper functioning. The ignition process doesn’t develop as it should, so the proper investigation will be necessary.

Bryant code 23

When your furnace is signaling code 23, the blower airflow selection has developed a problem.

Bryant error code 41

When the blower doesn’t run at the correct revolutions per minute, the error code 41 will flash.

Bryant code 43

Should your furnace have developed a problem with the pressure switch calibration, the error code, 43 will inform you.

Bryant code 45

Your furnace is in lockout because something is wrong with the control circuitry. It will take an hour until the furnace will reset automatically.
Bryant furnace flashing yellow light

Should you notice a flashing yellow light, polarity may be reversed. Proper polarity will be necessary for fixing the problem.


Should you notice the LED 1 on red, you need to address the problem immediately as your furnace is running in emergency heat.


When this happens, it means that the microprocessor didn’t run correctly.  You will need to reset it, so here are the steps to take:

  • Switch the setup button SW-1 in the On position and jumper thermostat terminals “R,” “W/W1”, and “Y/Y2” at the same time with the door button pushed in, as the power to the furnace is On.
  • Disconnect the jumper, putting the setup button in the Off position.
  • You will need to replace the primary control board when the LED2 keeps reappearing.


If that happens, the furnace is running in high heat.


A green LED 4 on means that your unit is running in low heat.


Should the line voltage polarity be reversed, a red LED2 will be flashing.

CODE: 1-1

This code reveals that no faults have developed throughout the last five cycles. You will need to go over the fault history.

Begin with placing the setup button “SW-1” in the On position, and the jumper thermostat terminals “R,” “W/W1”, and “Y/Y2” at the same time, until you notice an “11” flashing.

CODE: 1-2

The blower calibration is in a lockout, and the code shows that RPM measured for low heat is below 250RPMP or higher than 1300 RPM on two tries. It will take three hours for automatic reset. You will also have to reset the power.

CODE: 1-3

You will notice a limit switch lockout, and the code informs that ten next limit trips have occurred throughout high heat; three limit trips may have also happened throughout a low heat. Again, the system will reset automatically three hours later.

You will have to check for wrongfully high/low heat gas input adjustment or misaligned limit or/and limit shield. The high heat solenoid in the gas valve could also be stuck.

CODE: 1-4

The ignition is in a lockout, so your furnace will reset automatically after three hours.

CODE: 2-1

When you notice this code, it means that invalid model selection took place. The model plug is incorrect or missing. Check the diagram for proper connector jumper location.

CODE: 2-2

A setup error has occurred as the setup switch SW-1 and SW-7 are wrongfully placed. The fault appeared when the next combinations took place:

  • Thermostat call with SW-6 On, SW-1 and SW-6 both On
  • Thermostat call with SW-1 On

CODE: 2-3

Invalid blower airflow selection took place, as the A/C or CF switch settings aren’t proper. The 14 and 042 units may generate 1-1/2 to 3-1/2 tons A/C and 600 to 1400CFM for running fan. The 20 and 060 models will generate 2 to 5 tons A/C and 800 to 2000CFM for running fans. When this code is flashing, the unit will default to the closest proper airflow.

CODE: 2-4

Typically, the secondary voltage fuse is open, so you have to look for a short circuit in secondary voltage (24 VAC) wiring.

CODE: 3-1

When you notice Bryant furnace three short one long flashing, the pressure switch reopened or didn’t close. If it has been open for more than five minutes, the inducer will turn off 15 minutes after attempting to start. A defective inducer motor, improper vent sizing, and excessive wind make common causes. The low inducer voltage, faulty pressure switch, and improper combustion air supply can also lead to the situation.

You should also check the inlet gas pressure (it may be too low) and see if the pressure tubing isn’t blocked. When the switch opens throughout the blower on-delay moment, the blower will come on for the blower off-delay.

CODE: 3-3

The code shows that a limit or flame rollout could be open. The blower may operate for 4 minutes or until the open switch remains. When the opening is over three minutes, the code will turn to lockout no.13. When it opens for less than 3 minutes, status code no.33 will keep on flashing until the blower turns off.

Manual resetting the flame rollout switch will be necessary. A loose blower wheel, blocked vent, excessive wind, improper vent sizing, or faulty connections could cause the problem. Dirty/blocked duct systems, faulty capacitor/blower motor may also generate the problem. At times, even improper combustion air supply may cause the issue.

CODE: 3-4

The ignition has failed, and your control will attempt three times before it goes into lockout no.14. When the flame signal is lost throughout the blower on-delay period, the blower will start for the appropriate blower off-delay. Here are the leading causes:

  • Oxide buildup on the flame sensor, so cleaning with fine steel wool may solve the issue.
  • Control ground continuity
  • The flame sensor isn’t ground.
  • The gas valve is faulty or has shut off.
  • Proper flame sense microamps
  • The hot surface ignitor is faulty.
  • The inlet gas pressure is low.
  • There’s improper flame carryover or difficult ignition.
  • Make sure that the green/yellow wire is attached to the furnace’s sheet metal.

CODE: 4-1

The code shows that the blower isn’t operating at the proper RPM. When the situation occurs together with the fault no. 44, you have to see the wiring to the motor. It’s also a good idea to take a look at the troubleshooting guide.

CODE: 4-2

The code informs that the inducer isn’t running at the measured RPM. It may have also not started in the first 10 seconds after the heat request was sent. You will need to observe the wiring to the motor or see the manual for a better explanation.

CODE: 4-3

The pressure switch calibration may be defective, and the code shows that low and high-pressure switch “make” points throughout high heat purge aren’t within the range of calibration. You will need to see if the condensate drain isn’t plugged. Water could be in vent piping, or a pipe could be sagging. Faulty pressure switch tubing connections or wrong pressure switch wiring could generate the problem. Also, out of calibration or faulty pressure switches could lead to issues.

CODE: 4-4

You may deal with a faulty blower calibration, and the code shows that the measured blower speed is under 250 or higher than 1300 RPM. The furnace will switch to low or high heat mode if it’s possible. The problem develops together with fault no.41, so you also have to look at the motor. When the pain appears independently, some undersized ductwork, blocked registers, or excessive static from a dirty filter could generate the problem.

CODE: 4-5

A control circuity lockout is present, but auto-reset will happen within an hour. Flame sense circuit failure, gas valve relay stuck open, and software check error could cause it. You will have to reset power for clearing lockout or replace control when the code reappears.


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