Code 34 — Furnace Ignition Fault

What does 34 mean?

This fault indicates a general problem with the furnace's ignition system. The furnace is unable to light the gas burner to produce heat.

• Igniter malfunction (hot surface igniter or spark igniter)
• No gas supply or low gas pressure
• Faulty flame sensor
• Blocked flue or intake vents
• Control board issue

Click steps to track your progress.

1. 1

   Check that the gas valve to the furnace is open.

2. 2

   Turn off power to the furnace at the circuit breaker for 30 seconds to clear the fault.

3. 3

   Ensure the furnace's exhaust and intake vents are clear of obstructions.

4. 4

   If the furnace still fails to ignite, contact a qualified HVAC technician for diagnosis and repair.