Lennox HVAC Error Code E16: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
E16
Brand
Lennox
Product Type
hvac
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code E16 on your Lennox HVAC system indicates an EEPROM (Electrically Erasable Programmable Read-Only Memory) fault. This usually points to a memory corruption or hardware issue on the control board. While sometimes a simple power reset can clear it, persistent E16 errors may require professional diagnosis or replacement of the control board.
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Tools You'll Need

How to Fix Error Code E16

  1. Power Cycle the HVAC System

    Turn off power at the breaker before touching any internal components. High voltage capacitors can hold a charge.

  2. Inspect the Thermostat Wiring

    Turn off power to the HVAC system before handling thermostat wires to avoid short circuits.

  3. Check for Loose Control Board Connections

    Ensure power is completely off at the breaker before opening the unit. Use a non-contact voltage tester to confirm.

  4. Replace the Control Board if Necessary

    Take a photo of the wiring before disconnecting. Static electricity can damage electronics; use an anti-static wrist strap if available.

Parts You May Need

Main control board
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Main control board
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Main control board
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Main control board
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When to Call a Professional

If the error returns after a power cycle and control board replacement, or if you are uncomfortable working with high-voltage electrical components, call a licensed HVAC technician. Persistent EEPROM faults may indicate a deeper electrical issue or require specialized programming not available in DIY settings.

Frequently Asked Questions

Can I fix Lennox error E16 by simply turning the system off and on?
Yes, sometimes a simple power reset (keeping the system off for at least 5 minutes) can clear a transient EEPROM glitch. If the error returns, further steps are needed.
What does EEPROM fault mean on a Lennox HVAC?
It means the control board's memory chip has a corruption or hardware failure, which can cause incorrect system operation or failure to start.
How much does it cost to replace a Lennox control board?
A replacement Lennox control board typically costs between $150 and $400 for the part alone, plus $100–$200 for professional installation if hired.
Can a dirty air filter cause error E16?
No, E16 is an electronic fault and is not directly caused by airflow issues. However, a dirty filter may cause other operational problems that could trigger secondary errors.
Is it safe to continue running my HVAC with error E16?
It is not recommended. The system may operate erratically or fail to start, potentially causing further damage. It's best to address the error promptly.

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