1 blink
Moderate
Trane · HVAC Systems (AC, Furnaces & Heat Pumps)
System Lockout - Retries Exceeded
Quick Answer
Error code 1 blink on your Trane HVAC Systems (AC, Furnaces & Heat Pumps) means: System Lockout - Retries Exceeded. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Turn off power to the furnace for 60 seconds to reset the lockout
2
Check for other blink codes that may appear after reset to identify root cause
3
Inspect the ignition system including igniter, flame sensor, and gas valve
4
Verify gas supply pressure at the manifold (3.5 in WC for natural gas)
5
If lockout recurs after reset, a licensed HVAC technician should perform a full combustion analysis
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
Flame sensor
Control board
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