Carrier

31

Lockout

Metal-vent draft / inducer

Category I draft will not prove. NEVER a PVC condensate trap.

10 plates — walk the one on the cabinet

First check

1 Prove inducer and the live code

Do not pull power — that clears the Carrier 58CVA active code. Write 31. Is the inducer spinning on this call? Silent inducer is not a pressure switch. Chimney liner, cap, common-vent tables, inducer wheel.

Expect: 120 VAC at the inducer on a heat call. Wheel turning.

If fail: 120 VAC missing → IFC / door switch / incoming power. Voltage + dead motor → inducer.

If pass: Inducer running + this code → trap, hose, switch, vent (step 2).

The rest of the walkthrough is Diagnose.

On the plates

Trap, collector, PVC, wind, inducer RPM (42 if the inducer itself is out of band).
If open >5 min, many of these IFCs park the inducer 15 min before retry.
Trap, collector, PVC slope, wind, inducer.
Attic jobs: ice in the vent, dry-siphoned or frozen trap.
If the door card also lists 32, treat 32 as this same single PS path — confirm the sticker.
Chimney liner, cap, common-vent tables, inducer wheel.
Not a PVC trap and not a collector box. Do not cut a ‘condensate’ drain that does not exist.
PS hose to the inducer housing can hold flue condensate on a long metal run — still Category I, still not a 59SC5 collector.

Plates that use 31

Same number, other makers

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