Trane Error Code 8: Low Flame Signal
LED Blink Pattern
LED blinks 8 times.
How to Fix Trane Code 8
- Step 1: Turn off your Trane HVAC system at the thermostat and the main gas valve.
- Step 2: Do not attempt to open the unit or perform any repairs yourself. This could cause further damage or safety risks.
- Step 3: Contact a licensed Trane HVAC technician for a professional diagnosis and repair.
How to Reset Trane Code 8
- 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 8 Mean?
When your Trane HVAC system displays error code 8, it indicates a low flame signal in the burner assembly. This could be due to a faulty igniter, clogged flame sensor, or low gas pressure. The system is designed to protect itself and your safety by shutting down when it detects this issue. It's important not to ignore this error as it could lead to further damage or safety hazards.
Common Causes
- Faulty igniter
- Clogged flame sensor
- Low gas pressure
- Wiring issues
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| System is not igniting | Igniter resistance with multimeter | Less than 10 ohms |
| Flame sensor is dirty | Clean flame sensor with emery cloth | Clean sensor |
| Gas pressure is low | Manifold gas pressure with gauge | 10-15 inches W.C. |
Applicable Trane Models
Recall Notices
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 |
|---|---|---|---|
| Igniter | Trane 120-8160 | — | Find Part |
| Flame sensor | Trane 120-8170 | — | Find Part |
| Gas valve | Trane 120-8200 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Trane model families as 8.
| Code | Description | Severity |
|---|---|---|
| 2 | System Lockout | Warning |
| 3 | Pressure Switch Error | Warning |
| 4 | Open Limit Switch | Warning |
| 5 | Flame Sensed With Gas Off | Warning |
| 6 | Polarity/Grounding Error | Warning |
| 7 | Gas Valve Circuit Error | Warning |
| 9 | Igniter Problem | Warning |
| FAST-FLASH | Active Call for Heat | Warning |
| SLOW-FLASH | Normal Operation (Standby) | Warning |
| STEADY-OFF | No Power | Warning |