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Trane · Furnace

E6.1 120 V polarity reversed

Medium severity Trane S8V2Trane S8B1Trane S8X1Trane S8X2

What the control is telling you

The control sees hot and neutral swapped on the incoming supply. The IFC is polarity sensitive: the hot leg must go to the black lead.

Applies to: Trane S8V2 (80%, 2-stage, variable speed, Link) and S8B1 / S8X1 / S8X2 (80%, 1- and 2-stage)

Likely causes

  • Line and neutral swapped at the junction box or panel

Test and repair steps

  1. Power off at the disconnect.
  2. Measure from the incoming white (neutral) to green ground: about 120 V means hot and neutral are reversed.
  3. Swap the 120 VAC leads so the hot goes to the black furnace lead.
  4. Restore power and confirm the code clears.

Settings for these units

Clearance to combustibles · Trane S8V2

Cabinet widthVertical sides / topHorizontal sides / top
14.5 in.0 / 1 in.1 / 2 in.
17.5 in.0 / 1 in.1 / 2 in.
21.0 in.0 / 1 in.1 / 3 in.
24.5 in.0 / 1 in.1 / 5 in.

24 in. front service access.

3 in. in front of the combustion air openings.

Return filter size by cabinet width · Trane S8V2

Cabinet widthFilter
14-1/2 in.1 - 14 x 25 x 1 in.
17-1/2 in.1 - 16 x 25 x 1 in.
21 in.1 - 20 x 25 x 1 in.
24-1/2 in.1 - 24 x 25 x 1 in.

Filters are field supplied and mounted outside the cabinet.

Over 1600 CFM upflow: return on both sides, one side plus bottom, or bottom only.

Models that show this code

37 models in Trane S8V2, Trane S8B1, Trane S8X1, Trane S8X2

S8B1A026M2PSABS8B1A040M3PSABS8B1B040M2PSABS8B1B060M3PSABS8B1B060M4PSABS8B1B080M4PSABS8B1C080M5PSABS8B1C100M5PSABS8B1D120M5PSABS8V2A040M3PCBS8V2A040M3PDS8V2B060M4PCBS8V2B060M4PDS8V2B080M4PCBS8V2B080M4PDS8V2C080M5PCBS8V2C080M5PDS8V2C100M5PCBS8V2C100M5PDS8V2D120M5PCBS8V2D120M5PDS8X1A026M2PSABS8X1A040M3PSABS8X1B040M2PSABS8X1B060M3PSABS8X1B060M4PSABS8X1B080M4PSABS8X1C080M5PSABS8X1C100M5PSABS8X1D120M5PSABS8X2A040M3PSABS8X2B060M3PSABS8X2B060M4PSABS8X2B080M4PSABS8X2C080M5PSABS8X2C100M5PSABS8X2D120M5PSAB

Other codes on the same units

  • E4.0 Main high limit open
  • E4.1 Reverse airflow limit open
  • E4.2 Flame rollout switch open
  • E05 Flame sensed when no flame should be present
  • E6.2 Ground not detected
  • E6.3 Igniter open or igniter relay fault
  • E7.1 1st stage gas valve (MVL) powered with no call
  • E7.2 Redundant relay (HLO output) on with no call

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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. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.