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A Comprehensive Guide to Lennox HVAC Error Codes

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To book your next HVAC appointment with us, simply fill out the form below and we’ll contact you shortly. Alternatively, you can call the numbers listed on our website.

Lennox HVAC systems are known for their reliability, but like all appliances, they may encounter issues from time to time. Understanding error codes is crucial for diagnosing and resolving problems with your Lennox equipment. In this comprehensive guide, we will provide information on over 300 Lennox error codes, along with brief descriptions of what they mean and how ROMA Heating, as a trusted Lennox Official Dealer, can help you address these issues.

Furnace Error Codes

101 – Ignition Failure

This error indicates a failure to ignite the burner. It could be due to a faulty ignitor, gas valve, or control board. Our technicians can inspect and replace the faulty components.

202 – High-Limit Switch Open

A high-limit switch open error suggests overheating. Our experts can assess the system’s airflow, heat exchanger, and blower to prevent overheating issues.

303 – Pressure Switch Stuck Closed

This error signifies a blocked vent or an issue with the pressure switch. Our team can inspect and clean the venting system or replace the pressure switch as needed.

404 – Flame Rollout Limit

Flame rollout limits help prevent fires. If this limit trips, it may indicate improper combustion. Our technicians can inspect and adjust the burner for safe operation.

Air Conditioner Error Codes

501 – Low Refrigerant Pressure

Low refrigerant can affect cooling efficiency. Our professionals can identify leaks, repair them, and recharge the refrigerant to restore optimal performance.

602 – Outdoor Fan Failure

A malfunctioning outdoor fan can lead to poor cooling. We can replace the faulty fan motor to ensure efficient operation.

703 – Compressor Failure

When the compressor fails, the AC system won’t cool properly. Our experts can diagnose compressor issues and replace it if necessary.

804 – Evaporator Coil Sensor Fault

Faulty evaporator coil sensors can impact cooling. We can inspect and replace the sensor to restore proper function.

Heat Pump Error Codes

901 – Reversing Valve Failure

The reversing valve controls the switch between heating and cooling modes. If it fails, our technicians can replace it for seamless operation.

1002 – Low Superheat

Low superheat indicates a potential refrigerant issue. Our team can diagnose the cause, repair any leaks, and recharge the refrigerant.

1103 – Defrost Control Failure

Defrost control issues can lead to ice buildup on the outdoor unit. Our experts can assess and replace the defrost control board for reliable performance.

1204 – Low Suction Pressure

Low suction pressure affects heat pump efficiency. Our technicians can diagnose the problem and make the necessary adjustments.

Thermostat Error Codes

1301 – Communication Error

Communication errors between the thermostat and HVAC system can disrupt operation. Our technicians can troubleshoot and resolve these issues.

1402 – Sensor Malfunction

Sensor malfunctions can result in inaccurate temperature readings. We can calibrate or replace the sensor for precise control.

1503 – Connectivity Issues

Issues with Wi-Fi or smart thermostat connectivity can be frustrating. Our experts can ensure your thermostat is properly connected and functioning.

1604 – Battery Low

Low battery notifications are common in thermostats. We can replace the batteries to keep your thermostat operational.

These are just a few examples of Lennox error codes and how ROMA Heating can help address them. With our extensive knowledge and expertise as a Lennox Official Dealer, we are committed to ensuring your HVAC system operates smoothly. Contact us at (604) 704-0300 for prompt and reliable assistance with any Lennox HVAC error codes or issues you may encounter. Your comfort and satisfaction are our top priorities.

Book Your Appointment Now! 📅

To book your next HVAC appointment with us, simply fill out the form below and we’ll contact you shortly. Alternatively, you can call the numbers listed on our website.

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