Trane furnace error codes

30 codes with causes and test steps, plus 7 settings tables.

Code	Meaning	Severity
E01	Furnace control internal failure	High
E2.1	Ignition retries exceeded - flame never proven (1 hour lockout)	High
E2.2	Flame recycles exceeded - flame lost after lighting (1 hour lockout)	High
E2.3	1st stage gas valve not powered when it should be (10 times)	High
E3.1	1st stage pressure switch (PS1) closed when it should be open	Medium
E3.2	1st stage pressure switch (PS1) open when it should be closed	Medium
E3.3	2nd stage pressure switch (PS2) closed when it should be open	Medium
E3.4	2nd stage pressure switch (PS2) open when it should be closed	Medium
E04	Open limit (main limit, rollout or reverse airflow)	High
E4.0	Main high limit open	High
E4.1	Reverse airflow limit open	High
E4.2	Flame rollout switch open	Critical
E05	Flame sensed when no flame should be present	Critical
E6.1	120 V polarity reversed	Medium
E6.2	Ground not detected	Medium
E6.3	Igniter open or igniter relay fault	High
E7.1	1st stage gas valve (MVL) powered with no call	Critical
E7.2	Redundant relay (HLO output) on with no call	Critical
E08	Low flame signal (still running)	Low
E11	Gas valve relay / valve circuit fault	High
E12	Control fuse open	Medium
E13	Blower motor size / OEM ID mismatch	Medium
E14	Configuration file error	Medium
E17	Blower motor communication error	High
E23	Menu data not received by combustion micro (CCM)	Medium
E24	Internal communication error between ACM and CCM	Medium
E25	Orientation sensor out of range	Low
E26	Return static pressure sensor out of range or not connected	Low
E27	Return air thermistor out of range or not connected	Low
E28	Supply air thermistor out of range or not connected	Low

Settings and specs

Clearance to combustibles

Clearances · Trane S8V2

Cabinet width	Vertical sides / top	Horizontal 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.
Downflow on combustible floor without coil needs BAYBASE205.
Garage: burners and igniter at least 18 in. above floor.

Source: Trane FNR-SVX003A-EN (S8V2) - Table 5

Return filter size by cabinet width

Filters · Trane S8V2

Cabinet width	Filter
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.

Source: Trane FNR-SVX003A-EN (S8V2) - Table 30

Return filter size by cabinet width

Filters · Trane S8B1, Trane S8X1, Trane S8X2

Cabinet width	Filter
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.

Source: Trane 18-CE14D1-1A-EN (S8B1/S8X1/S8X2) - Return Air Filters

Return filter size - upflow and downflow

Filters · Trane S9X1, Trane S9X2, Trane S9B1

Cabinet width	Upflow	Downflow
17-1/2 in.	1 - 16 x 25 x 1 in.	2 - 14 x 20 x 1 in.
21 in.	1 - 20 x 25 x 1 in.	2 - 16 x 20 x 1 in.
24-1/2 in.	1 - 24 x 25 x 1 in.	2 - 16 x 20 x 1 in.

Field supplied, installed outside the cabinet.
Upflow over 1600 CFM needs two returns or a bottom return.

Source: Trane 18-CE12D1-1D-EN (S9X1/S9X2/S9B1) - Return Air Filters

Clearance to combustibles

Clearances · Trane S9X1, Trane S9X2, Trane S9B1

Position	Back	Top
Upright closet	1 in.	1 in.
Horizontal closet / alcove	1 in.	1 in.
Horizontal, flue out left	1 in.	1 in.

24 in. front clearance recommended for service.
Furnace must sit level (slight tilt left/forward allowed) so condensate drains.

Source: Trane 18-CE12D1-1D-EN (S9X1/S9X2/S9B1) - Locations and Clearances

Return filter size - upflow and downflow

Filters · Trane S9V2

Cabinet width	Upflow	Downflow
17-1/2 in.	1 - 16 x 25 x 1 in.	2 - 14 x 20 x 1 in.
21 in.	1 - 20 x 25 x 1 in.	2 - 16 x 20 x 1 in.
24-1/2 in.	1 - 24 x 25 x 1 in.	2 - 16 x 20 x 1 in.

Field supplied, installed outside the cabinet.
Upflow over 1600 CFM needs two returns or a bottom return.

Source: Trane 18-CE19D1-1B-EN (S9V2) - Return Air Filters

Clearance to combustibles

Clearances · Trane S9V2

Position	Back	Top
Upright closet	1 in.	1 in.
Horizontal closet / alcove	1 in.	1 in.
Horizontal, flue out left	1 in.	1 in.

24 in. front clearance recommended for service.
Furnace must sit level (slight tilt left/forward allowed) so condensate drains.

Source: Trane 18-CE19D1-1B-EN (S9V2) - Locations and Clearances

Models covered

S8B1A026M2PSABS8B1A040M3PSABS8B1B040M2PSABS8B1B060M3PSABS8B1B060M4PSABS8B1B080M4PSABS8B1C080M5PSABS8B1C100M5PSABS8B1D120M5PSABS8V2A040M3PCBS8V2A040M3PDS8V2B060M4PCBS8V2B060M4PDS8V2B080M4PCBS8V2B080M4PDS8V2C080M5PCBS8V2C080M5PDS8V2C100M5PCBS8V2C100M5PDS8V2D120M5PCBS8V2D120M5PDS8X1A026M2PSABS8X1A040M3PSABS8X1B040M2PSABS8X1B060M3PSABS8X1B060M4PSABS8X1B080M4PSABS8X1C080M5PSABS8X1C100M5PSABS8X1D120M5PSABS8X2A040M3PSABS8X2B060M3PSABS8X2B060M4PSABS8X2B080M4PSABS8X2C080M5PSABS8X2C100M5PSABS8X2D120M5PSABS9B1B040D3PSS9B1B040U3PSS9B1B060D3PSS9B1B060U4PSS9B1B080D4PSS9B1B080U4PSS9B1C080U5PSS9B1C100D5PSS9B1C100U5PSS9B1D120D5PSS9B1D120U5PSS9V2B040U3VSACS9V2B060U3VSACS9V2B080D4VSACS9V2B080U4VSACS9V2C100D4VSACS9V2C100U4VSACS9V2D120U5VSACS9X1B040D3PSS9X1B040U3PSS9X1B060D3PSS9X1B060U4PSS9X1B080D4PSS9X1B080U4PSS9X1C080U5PSS9X1C100D5PSS9X1C100U5PSS9X1D120D5PSS9X1D120U5PSS9X2B040D3PSS9X2B040U3PSS9X2B060D3PSS9X2B060U4PSS9X2B080D4PSS9X2B080U4PSS9X2C080U5PSS9X2C100D5PSS9X2C100U5PSS9X2D120D5PSS9X2D120U5PS

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.