Lennox HVAC Error Code E38: How to Fix It

Q: What does Lennox error code E38 mean?

Error code E38 means the inducer pressure is low. The inducer fan isn't creating enough pressure to safely vent combustion gases, so the furnace shuts down as a safety precaution.

Q: Can I reset Lennox error E38?

Yes, after fixing the underlying issue, turn off power to the furnace for 30 seconds, then turn it back on. The error should clear. If it returns, the problem isn't fixed.

Q: How much does it cost to repair Lennox E38?

DIY repairs cost under $50 for parts like a pressure switch. Professional repairs range from $150 to $400, depending on whether the inducer motor needs replacement.

Q: What causes low inducer pressure on Lennox furnace?

Common causes include blocked vent pipe, clogged condensate drain, faulty pressure switch, failed inducer motor, or debris in the inducer housing.

Q: Is it safe to run my furnace with error E38?

No. The furnace shuts down to prevent carbon monoxide poisoning. Do not attempt to bypass the safety controls. Fix the issue before restarting.

Abstract

Lennox error code E38 indicates that the inducer pressure is too low, meaning the inducer fan isn't creating enough airflow to properly vent combustion gases. This is often caused by a blocked vent, faulty pressure switch, or failing inducer motor. Follow these steps to diagnose and fix the issue.