Lennox HVAC Error Code E200: How to Fix It

Q: What causes Lennox error code E200?

E200 is caused by a pressure switch that remains closed when it should be open during startup. Common causes include a faulty pressure switch, blocked venting, damaged pressure switch tubing, or issues with the inducer motor assembly.

Q: Can I reset Lennox error code E200?

You can try resetting by turning off power for 5 minutes then turning it back on, but E200 typically indicates a hardware problem that requires repair. The error will likely return until the underlying issue is fixed.

Q: Is it safe to run my furnace with error code E200?

No, never attempt to bypass or ignore error code E200. This safety error prevents dangerous operating conditions and protects against potential carbon monoxide issues or combustion problems.

Q: How much does it cost to fix Lennox error E200?

DIY pressure switch replacement costs $30-80 for the part. Professional repair typically ranges from $150-400 depending on the root cause and whether additional components need replacement.

Q: How do I know if my Lennox pressure switch is bad?

A bad pressure switch will show continuity when it should be open, may have visible damage or corrosion, or fail to respond properly during furnace startup. Professional testing can confirm if the switch is operating within specifications.

Abstract

Lennox HVAC error code E200 indicates the pressure switch is closed when it should be open during startup. This safety error prevents your heating system from operating and typically occurs due to a faulty pressure switch, blocked venting, or control board issues.