Lennox HVAC Error Code E202: How to Fix It

Q: What causes Lennox error code E202?

E202 occurs when the pressure switch fails to close during inducer fan operation, usually due to blocked exhaust vents, damaged vent pipes, clogged condensate drains, or faulty pressure switches.

Q: Is it safe to run my Lennox furnace with E202 error?

No, never operate your furnace with an E202 error. This indicates ventilation problems that could lead to dangerous carbon monoxide buildup in your home.

Q: How often should I check my furnace vents?

Inspect your exterior vents monthly during heating season, especially after storms or heavy snow. Clear any visible debris immediately to prevent operational issues.

Q: Can frozen vents cause E202 error?

Yes, ice buildup in exhaust or intake vents can block proper airflow and trigger E202. Clear ice carefully and consider adding vent guards to prevent future freezing.

Q: Will replacing the pressure switch fix E202?

Not usually. E202 typically indicates a real ventilation problem, not a faulty switch. Address vent blockages first before considering pressure switch replacement.

Abstract

Lennox error code E202 indicates the pressure switch failed to close during the inducer fan prove sequence, typically caused by a blocked vent or exhaust pipe. This is a serious safety issue that prevents your furnace from operating properly to avoid dangerous backdrafting of combustion gases.