Bryant
31
LockoutDraft / PS
High-fire or active-stage prove failed.
Walk 31 in Diagnose
13 plates — walk the one on the cabinet
First check
1 Prove inducer and the live code
Do not pull power — that clears the Bryant 800S active code. Write 31. Is the inducer spinning on this call? Silent inducer is not a pressure switch. Cap, liner, common vent, inducer wheel. Not a PVC trap.
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, wind, inducer. One hose, one switch.
- Do not hunt a high-fire hose.
- Does the inducer actually go high?
- High-fire hose not teed to the low switch.
- Vent capacity on 100/120 cabinets.
- Trap, collector, PVC, wind, inducer. 912S still has a 92% collector — not a chimney.
Plates that use 31
Same number, other makers
31 on Bryant is not the same code on these plates.