5 blinks
Moderate
Trane · HVAC Systems (AC, Furnaces & Heat Pumps)
Flame Sensed Without Gas Valve Call
Quick Answer
Error code 5 blinks on your Trane HVAC Systems (AC, Furnaces & Heat Pumps) means: Flame Sensed Without Gas Valve Call. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Immediately shut off gas supply to the furnace as this indicates a potential gas leak
2
Inspect the gas valve for signs of leaking using a combustible gas detector
3
Check flame sensor wiring for shorts or damage
4
Test the gas valve by disconnecting the leads and checking for gas flow (should be none)
5
This is a critical safety fault. A licensed HVAC technician must perform the 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
Related Error Codes