Payne Furnace Troubleshooting: An easy Step-by-step guide & understanding error codes

Your furnace's efficiency will suffer or it may turn off altogether if the filter becomes blocked, which can lead to inefficient operation. First, disconnect the power source from your furnace. Then, take off the panel that allows you to access the filter. Throw it out or give it a quick wash if it can be reused if it gets dirty.

A diagnostic system is integrated into Payne furnaces. See the LED light through the access panel's sight glass. To find the problem, look at the troubleshooting codes that you've seen, such as the ones in the given screenshots. Let's look at the codes along with their explanations:-

Red LED Codes

• RED LED1 ON: The furnace is operating in emergency heat, indicating an issue outside normal heating parameters.

• RED LED2 ON: There's a microprocessor malfunction. Resetting involves specific steps with the thermostat terminals and power unit.

• RED LED2 FLASHING: A reversed line voltage polarity has been detected, requiring electrical system checks.

Yellow and Green LED Codes

• YELLOW LED3 ON: The furnace is operating in high heat, typically normal during colder conditions or if the thermostat is set for a higher temperature.

• GREEN LED4 ON: Indicates low heat operation, which may be due to milder weather or lower thermostat settings.

Detailed Two-Digit Status Codes

The two-digit status codes provide a more in-depth diagnosis of the furnace's condition, combining the number of flashes from the yellow and green LEDs with every step image:

• 11: No fault in recent history display; the system is operating as expected.

• 12: Blower calibration lockout; the blower speed has been out of the required range during two attempts.

• 13: Limit switch lockout, indicating multiple limit trips during operation.

• 14: Ignition lockout; the control will auto-reset after three hours.

• 21: Invalid model selection; a mismatch in model configuration is detected.

• 22: Setup error; issues with the setup switch settings are found.

• 23: Invalid blower airflow selection; the blower is set outside the valid speed range.

• 24: The secondary voltage fuse is open; this typically indicates a short circuit in the wiring.

• 31: The pressure switch did not close or has reopened, a possible sign of blockage or venting issues.

• 33: Limit circuit fault; often related to airflow problems or a defective blower motor.

• 34: Ignition proving failure; the furnace has an issue with the ignition sequence.

• 41: Blower outside valid speed range; the blower is not operating at the calculated RPM.

• 42: Inducer outside valid speed range; similar to code 41, but regarding the inducer motor.

• 45: Control circuitry lockout; indicative of repeated software checks or flame sensing issues.

Ensure the gas valve is turned to the "ON" position, allowing gas to flow to the burners. If the furnace isn't igniting, the problem could be with the igniter. Be cautious—if you're unsure about dealing with gas or ignition components, it's better to call an HVAC technician.

If your furnace turns on but the flame has shut off quickly, the flame sensor may need cleaning. If comfortable doing so, remove the sensor, clean it with a soft cloth, and replace it by getting a new one installed. Also, inspect the burners for any obvious signs of blockage or debris.

Check if the blower motor is running; you should hear it if it’s working. If not, this could be due to a faulty motor, capacitor, or control board issue. The fan should also operate smoothly without strange noises or hindrances.

Sometimes, a simple reset can fix a temporary glitch. Turn off the furnace power from the breaker for a minute and then turn it back on. This can clear some fault codes and allow the furnace to attempt to restart.

If you’ve gone through these steps without success, or if you’ve identified a problem that requires professional intervention, it’s time to contact a state-licensed mechanical expert. HVAC technicians like Comfort Union and their team are prepared to diagnose and fix more complex issues. They have the necessary tools, safety training, and experience to handle gas furnaces, igniters, high-voltage components and your heat pump.