Furnace Ignition Problems in Greater Vancouver

Modern furnaces use either a hot surface igniter (a glowing element) or an intermittent pilot ignition system to light the burner. When ignition fails, the furnace will attempt to light two or three times then enter a lockout mode.

What This Symptom Means

Ignition failure means the furnace control board has tried to light the burner the allowed number of times and has shut off the gas valve for safety. The blower may continue briefly. Most furnaces display a blink code identifying the ignition lockout.

Common Causes

• Hot surface igniter cracked or failed — no longer reaches ignition temperature
• Igniter covered in dust or contamination affecting its glow
• Gas valve not opening due to electrical fault or solenoid failure
• Flame sensor failing to detect flame after successful ignition (causing repeated relighting attempts)
• Pressure switch fault preventing ignition sequence from starting
• Control board not sending power to igniter at the correct time
• Low gas pressure to the furnace

What Homeowners Can Check Safely

• Check furnace blink code — ignition lockout typically has a specific pattern listed on the door label
• Turn furnace off at the power switch for 30 seconds, then back on — some boards allow one manual reset
• Check that other gas appliances (stove, water heater) are working to rule out a gas supply problem

When to Call a Licensed Technician

Some furnace issues require a licensed HVAC technician. Do not attempt to open gas lines, replace internal components, or reset persistent lockouts without professional diagnosis.

• Hot surface igniter testing and replacement
• Gas valve electrical testing
• Flame sensor cleaning and testing
• Ignition sequence diagnostic using a multimeter on control board outputs
• Pressure switch and draft inducer inspection

Frequently Asked Questions

Why does my furnace click but not light?

Clicking during ignition is the sound of the spark igniter or gas valve attempting to operate. If you hear clicking but no ignition, either the gas is not reaching the burner or the spark is not strong enough to light it. Common causes include a partially closed gas valve, low gas pressure, a weak igniter, or a dirty burner. A technician can test each stage of the ignition sequence.

How long do furnace igniters last?

Hot surface igniters typically last 5–10 years. They are fragile ceramic elements that can crack from physical contact, rapid thermal cycling, or age-related fatigue. Replacement is a straightforward repair that restores ignition immediately.

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