Error Code

Lennox Furnace Error Code E227

Pressure Switch Stuck Open

What This Error Code Means

Error code E227 appears when your Lennox furnace detects that the pressure switch is stuck in the open position. The pressure switch is a critical safety device that verifies proper airflow through the heat exchanger and venting system.

When the pressure switch remains open, it means the furnace control board is not receiving the signal that proper draft pressure has been established. Without this confirmation, the furnace will not ignite as a safety precaution.

Do NOT Attempt to Run Your Furnace

Error code E227 indicates a ventilation or airflow problem. Running your furnace with this error could lead to:

Carbon monoxide buildup in your home
Damage to the heat exchanger
Complete furnace failure
Safety hazards for your family

Call ROMA Heating & Cooling immediately at 778-909-5731

Common Causes

Blocked or Restricted Venting

Snow, ice, bird nests, or debris blocking the intake or exhaust pipes prevent proper airflow. This is especially common in Greater Vancouver during winter months.

Faulty Inducer Motor

The inducer motor creates the draft pressure needed to close the pressure switch. If it's failing or running slowly, insufficient pressure will keep the switch open.

Defective Pressure Switch

The pressure switch itself may be faulty, stuck, or have deteriorated over time. These switches can fail mechanically or electrically.

Disconnected or Damaged Pressure Hose

The rubber hose connecting the pressure switch to the inducer housing can become disconnected, cracked, or clogged with condensation or debris.

Condensate Drain Blockage

A clogged condensate drain can cause water backup that affects pressure switch operation and creates improper draft conditions.

What You Can Check (Safe Homeowner Steps Only)

Safe Inspection Steps

These are the ONLY steps homeowners should attempt:

Check Outdoor Venting

Go outside and inspect both PVC pipes (intake and exhaust) on the exterior of your home. Remove any visible snow, ice, or debris. Never block or obstruct these pipes.

Verify Thermostat Settings

Ensure your thermostat is set to HEAT mode and the temperature setting is higher than the current room temperature.

Check Air Filter

A severely clogged air filter can affect overall furnace operation. Replace it if it's dirty, though this rarely causes E227 specifically.

Power Reset

Turn off power to the furnace for 30 seconds, then turn it back on. If the error persists after restart, call a professional immediately.

When to Stop and Call a Professional

Call ROMA Heating & Cooling immediately if:

The error persists after checking outdoor vents and resetting power
You hear unusual noises from the furnace (grinding, squealing, or rumbling)
The inducer motor won't start or sounds weak
You're unsure about any inspection or repair procedure
It's winter and you have no heat

DO NOT attempt to disassemble the furnace, test electrical components, or bypass safety switches. This work requires professional tools, training, and licensing.

Same-Day & Emergency Furnace Repair

Serving Greater Vancouver

ROMA Heating & Cooling has been repairing Lennox furnaces in Greater Vancouver since 1999. Our licensed technicians are available for same-day emergency service.

Licensed • Bonded • Insured

Call 778-909-5731

Available for emergency service throughout Vancouver, Burnaby, Richmond, Surrey, Coquitlam, and all of Greater Vancouver

Related Lennox Error Codes

Error Code E228

Pressure Switch Stuck Closed

Error Code E229

Pressure Switch Failed to Close

Error Code E224

Ignition Lockout

All Lennox Error Codes•Emergency Furnace Repair•Greater Vancouver Service Areas