FieldBench
Trane codes

Trane

E3.3

Lockout

Shorted second-stage pressure switch

Trane Link-enabled alarm table: second-stage PS is shorted / already made when the IFC expected it open.

Walk E3.3 in Diagnose

2 plates — walk the one on the cabinet

First check

1 Unplug the switch with the inducer off

On Trane S8V2 this code is the switch made when the inducer is not running. Unplug that switch only. This is Category I metal vent. There is no 96% collector or PVC trap to prime.

Expect: Code changes when the harness is open.

If fail: Wrong switch, or the IFC input is shorted.

If pass: Switch/hose path. Go to step 2.

The rest of the walkthrough is Diagnose.

On the plates

  • Unplug the second-stage switch. If the code changes, switch/hose. If not, IFC input.
  • W2 shorted to W1 can keep the high-fire path made. Confirm the call.
  • Two switches, two hoses. A tee is a miswire.
  • This is Category I metal vent. There is no 96% collector or PVC trap to prime.
  • Cap, liner, common-vent tables, inducer wheel, hose on the inducer housing.

Plates that use E3.3