Trane Furnace Code E3.2
Soft lockout
The first-stage pressure switch will not close, so the control cannot prove the draft inducer is moving flue gas and will not open the gas valve.
Manual wording: “Open Pressure Switch, 1st Stage”
Documented for: S8V2, S9V2 and S9V2-VS furnaces; on single-stage S8B1 the same code reads simply 'Open Pressure Switch'
Likely causes, most common first
- Open pressure switch, 1st stage
- Blocked or restricted vent or combustion air piping
- Condensate backing up in the drain or trap (condensing models)
- Draft inducer not running or running weak
- Pressure switch tubing disconnected or plugged
What you can safely check yourself
- Check the outdoor intake and exhaust pipes for snow, ice, leaves, or nests
- Check the condensate drain line and trap for a clog, and check that any condensate pump is working
- Check that the furnace blower door is fully closed
When to call a technician
If the vents and drain are clear, the pressure switch, its tubing, or the inducer needs a technician. Do not jumper the pressure switch.
A Trane furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Sources
- Installer's Guide - Upflow/Horizontal and Downflow Gas-Fired, Direct/Non-Direct Vent, 2-Stage Condensing Variable Speed Furnaces (18-CE01D1-1E-EN) (Trane, S9V2B040U3PSAA through S9V2D120D5PSAA two-stage condensing variable-speed furnaces) · checked 2026-08-25
- Installation, Operation, and Maintenance - Gas-Fired 2-Stage Condensing Variable Speed Furnaces with Variable Speed Draft Inducer (FNR-SVX001B-EN) (Trane, S9V2B040U3VSBB through S9V2D120D5VSBB (S9V2-VS) two-stage condensing variable-speed furnaces) · checked 2026-08-25
- Installation, Operation, and Maintenance - Link Communicating or 24 Volt Gas-Fired 2 Stage Induced Draft Furnaces with Variable Speed Motor (FNR-SVX003A-EN) (Trane, S8V2A040M3PCB through S8V2D120M5PCB two-stage 80% induced draft furnaces (communicating or 24V)) · checked 2026-08-25