Bryant furnace: Code 31 — Pressure Switch Did Not Close or Reopened
Try DIY first, then call a pro
Bryant furnaces share the Carrier control platform — this code table applies to the equivalent Bryant models. Confirm against your unit's panel label.
What does 3 short 1 long flashes mean on a Carrier furnace? If the switch stays open over 5 minutes, the inducer rests 15 minutes and retries. Official checklist: excessive wind, low inlet gas pressure (if LGPS used), disconnected or obstructed pressure tubing, defective switch.
GOOD NEWS: THE FIRST CHECKS ARE FREE AND TAKE MINUTES.
Try these first — in this order
Vent terminations (snow, nests) and tubing — 15 minutes.
Switch and inducer testing. DIY part cost: $30–60 — a pro visit for this class of fault typically runs $150–350.
What causes it (in order of likelihood)
- Blocked/disconnected tubing, wind-affected venting DIY-CHECKABLE
- Defective pressure switch TECH
Parts referenced by this code
Always match parts against your model's parts list — part numbers vary within a series.
Applies to
58STA · 58STX · Bryant 310/311/312 series · Payne PG8M series
Different Bryant generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.
Verified against Carrier 58STA/58STX Installation & Service Instructions (1106202L), p.37/48
Last verified 2026-07-06 · how we verify