6 blinks
Moderate
Trane · HVAC Systems (AC, Furnaces & Heat Pumps)
Ignition Failure / Lockout
Quick Answer
Error code 6 blinks on your Trane HVAC Systems (AC, Furnaces & Heat Pumps) means: Ignition Failure / Lockout. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Verify the gas supply is turned on and check other gas appliances for proper function
2
Remove and inspect the hot surface igniter for visible cracks or white discoloration
3
Measure igniter resistance (typically 40-200 ohms for silicon nitride igniters)
4
Verify 120VAC is present at the igniter leads during the ignition sequence
5
Check gas valve manifold pressure with a manometer (3.5 in WC natural gas, 10.0 in WC propane)
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Hot surface igniter
Gas valve
Burner assembly
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