Trane Error Code E08: Low flame signal (still running) (Furnace)
Trane error code E08 on a furnace means: Low flame signal (still running). It is also called Trane diagnostic code E08.
Homeowner? What Trane code E08 means for you
Usually minor Your furnace is reporting: Low flame signal (still running). This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
- Make sure the furnace front door or panel is closed properly; many furnaces will not run with the door switch open.
- Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
- Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
- Check that the gas valve next to the furnace is open (handle in line with the pipe). Do not force it.
- Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Trane error code E08 mean?
Flame current is weak but still high enough for the furnace to run. The S8V2 flowchart treats under 0.5 microamp as the trigger. Fix it before it turns into ignition lockouts.
Applies to: Trane S8V2 (80%, 2-stage, variable speed, Link) and S8B1 / S8X1 / S8X2 (80%, 1- and 2-stage)
Common causes of Trane code E08
- Dirty or oxidised flame sensor
- Sensor mispositioned
- Poor ground or loose sensor wire
Trane models that use code E08
Show all 37 models
S8B1A026M2PSABS8B1A040M3PSABS8B1B040M2PSABS8B1B060M3PSABS8B1B060M4PSABS8B1B080M4PSABS8B1C080M5PSABS8B1C100M5PSABS8B1D120M5PSABS8V2A040M3PCBS8V2A040M3PDS8V2B060M4PCBS8V2B060M4PDS8V2B080M4PCBS8V2B080M4PDS8V2C080M5PCBS8V2C080M5PDS8V2C100M5PCBS8V2C100M5PDS8V2D120M5PCBS8V2D120M5PDS8X1A026M2PSABS8X1A040M3PSABS8X1B040M2PSABS8X1B060M3PSABS8X1B060M4PSABS8X1B080M4PSABS8X1C080M5PSABS8X1C100M5PSABS8X1D120M5PSABS8X2A040M3PSABS8X2B060M3PSABS8X2B060M4PSABS8X2B080M4PSABS8X2C080M5PSABS8X2C100M5PSABS8X2D120M5PSAB
Other Trane Furnace codes
All Trane Furnace error codes →
Trane code E08: homeowner questions
What does Trane code E08 mean?
Low flame signal (still running). Flame current is weak but still high enough for the furnace to run. The S8V2 flowchart treats under 0.5 microamp as the trigger. Fix it before it turns into ignition lockouts.
Is it safe to keep using my furnace with code E08?
Usually yes. Code E08 is normally minor, but if it keeps coming back have it checked.
Can I reset Trane code E08 myself?
You can try one reset (power off for 30 seconds, then on). If Trane code E08 comes back, the cause is still there and a licensed technician should check it.
Who can fix Trane code E08 near me?
Aurora Star Tech Inc. repairs Trane furnaces in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: Furnace Not Turning On: What to Check · Furnace Blinking Light: What the Flash Codes Mean
Troubleshooting guides
- Blowing cold air All brands · Furnace
- No heat All brands · Furnace
- Short cycling All brands · Furnace
- Reading and clearing fault history - Trane S-Series IFC Trane · Furnace
Source: Trane FNR-SVX003A-EN (S8V2 installer's guide) - section Integrated Furnace Control Display Codes, Table 37 Error codes; Trane FNR-SVX003A-EN (S8V2 installer's guide) - section Troubleshooting (flowcharts); Trane 18-CE14D1-1A-EN (S8B1/S8X1/S8X2 installer's guide) - section Integrated Furnace Control Display Codes, Error Codes. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.