Trane Error Code 5: Flame Sensed With Gas Off
Warning: Your Trane furnace has detected a gas leak safety hazard. Turn off the gas supply and call a professional immediately.
LED Blink Pattern
LED blinks 5 times.
How to Fix Trane Code 5
- Step 1: Turn off the gas supply valve located near your furnace.
- Step 2: Do not attempt to operate the furnace until a professional has inspected and repaired the issue.
- Step 3: Call a licensed HVAC technician immediately to diagnose and fix the problem.
How to Reset Trane Code 5
- Turn off the furnace power switch, usually located on or near the unit.
- Turn off the circuit breaker for the furnace. Wait 30 seconds.
- Restore power at the breaker and flip the furnace switch back on.
- Set the thermostat to call for heat. If the error code returns after 2-3 ignition attempts, the fault requires repair.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Trane Error Code 5 Mean?
The 'Flame Sensed With Gas Off' error code on your Trane furnace indicates that the gas valve is closed, but the flame sensor still detects a flame. This could be due to a gas leak or a malfunctioning gas valve. It's crucial to address this issue promptly to ensure your safety.
Common Causes
- A gas leak near the furnace
- A faulty gas valve that's not closing properly
- A malfunctioning flame sensor
- A problem with the gas pressure regulator
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| You smell gas or see a gas leak | Turn off the gas supply valve and call a professional immediately. | No gas smell or leak |
| The gas valve is closed | Inspect the gas valve for any signs of damage or malfunction. | Gas valve closes properly |
| The gas pressure is within the manufacturer's specified range | Inspect the flame sensor for any signs of damage or soot. | Flame sensor is clean and undamaged |
Applicable Trane Models
Recall Notices
Trane/American Standard Gas-Electric Packaged Units Recalled Due to Fire Hazard 25-XXX Active
Issued: July 1, 2025
Affected models: Gas-electric packaged units manufactured Jan 2024 - Mar 2025
Fuel gas valve can open unexpectedly, creating gas leak and fire hazard. Stop using heating mode.
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Gas Valve | Trane 10000-0001 | — | Find Part |
| Flame Sensor | Trane 10000-0002 | — | Find Part |
| Gas Pressure Regulator | — | — | — |
Related Codes on Same Models
Other codes that affect the same Trane model families as 5.
| Code | Description | Severity |
|---|---|---|
| 2 | System Lockout | Warning |
| 3 | Pressure Switch Error | Warning |
| 4 | Open Limit Switch | Warning |
| 6 | Polarity/Grounding Error | Warning |
| 7 | Gas Valve Circuit Error | Warning |
| 8 | Low Flame Signal | Warning |
| 9 | Igniter Problem | Warning |
| FAST-FLASH | Active Call for Heat | Warning |
| SLOW-FLASH | Normal Operation (Standby) | Warning |
| STEADY-OFF | No Power | Warning |