FieldBench
Carrier codes

Carrier

23

Lockout

PS did not open

Draft switch still made when it should be open.

Walk 23 in Diagnose

7 plates — walk the one on the cabinet

First check

1 Unplug the switch with the inducer off

On Carrier 58SP0 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

  • Welded switch, water in hose, inducer still spinning when it should be off.
  • One switch — there is no ‘the other PS’ to swap to.
  • Welded switch, residual chimney draft, inducer still spinning.
  • 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 23

Same number, other makers

23 on Carrier is not the same code on these plates.