rapid flash
Moderate
Trane · HVAC Systems (AC, Furnaces & Heat Pumps)
Flame Detected Without Call for Heat
Quick Answer
Error code rapid flash on your Trane HVAC Systems (AC, Furnaces & Heat Pumps) means: Flame Detected Without Call for Heat. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Shut off the gas supply to the furnace immediately
2
Check for a gas smell near the burner area using a combustible gas leak detector
3
Disconnect the flame sensor wire and see if the code clears to isolate a wiring short
4
Inspect the gas valve for internal leakage
5
This is a safety-critical condition requiring a licensed HVAC technician for diagnosis and repair
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
Gas valve assembly
Flame sensor
Control board
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