HVAC Code Lookup

American Standard Furnace Code E3.2

Soft lockout

The 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”

Documented for: A951X condensing and A801X induced draft furnaces with the seven-segment IFC display

Likely causes, most common first

  1. Open pressure switch
  2. Blocked or restricted vent or combustion air piping
  3. Condensate backing up in the drain or trap (condensing models)
  4. Draft inducer not running or running weak
  5. Pressure switch tubing disconnected or plugged

What you can safely check yourself

  • Look for blockage - snow, ice, weeds, grass, leaves, or a nest in the furnace venting outside
  • On the A951X and other 95% condensing models, check the condensate drain line and trap for a clog and check that any condensate pump is working
  • Make sure the furnace door is on properly

When to call a technician

If the venting and drain are clear, the pressure switch, its tubing, or the inducer needs a technician. Do not jumper the pressure switch.

A American Standard furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Sources

Other American Standard codes