927T

This board

Preferred two-digit IFC (not Evolution ABCD)

• Codes are two digits: 11–14, 21–24, 31, 32, 33, 34, 41–45. Same language as Carrier 59TP6.
• A readout like 3 1.6 is often STAGE + CFM (stage 3 / 1,600 CFM) — not fault 31. Faults flash; run status is steadier. Confirm on THIS Bryant door card.
• 32 = low-fire PS. 31 on a high-fire call is the active-stage prove. Do not apply 916S ‘one switch’ thinking.
• InteliSense (when enabled with the matching Bryant/ecobee stat) does not change 31/33/34 meanings.

Sequence

1. W/W1. Inducer low → low-fire PS (32 family) → HSI → low-fire valve → flame (34 if no prove) → VS blower per model plug.
2. W2. Inducer high → high-fire switch → second solenoid. 23 = a switch that should have opened didn’t.
3. Limits. 33 is the open limit/rollout circuit. Three minutes of 33 becomes lockout 13 (3-hour auto reset).
4. Ignition fail. 34 repeats, then lockout 14 (3-hour auto reset).

Faults on this IFC

• 11

  No stored history

  info

  Memory empty or power was cycled.

  • Not a fault. Recreate the call and watch the live code.
• 12

  Blower on after power-up

  info

  Powered up on a W call — 90 s blower.

  • Normal after a brownout. Repeating 12 + 41 = VS calibration / static.
• 13

  Limit lockout

  lockout

  Limit/rollout stayed open. Auto-reset ~3 h.

  • Treat as a hardened 33. Filter, static, rise, rollout reset.
• 14

  Ignition lockout

  lockout

  Hardened 34. Auto-reset ~3 h.

  • HSI, gas, flame sensor, ground. Do not sit on resets.
• 21

  Gas-heat lockout / model plug

  lockout

  Valve relay fault or missing/wrong model plug.

  • Model plug seated for THIS 926T cabinet size. A 100 kBtu plug in an 80 kBtu cabinet overfires and limits.
  • Miswired valve.
• 22

  Flame with valve off

  hazard

  Flame sense while GV de-energized.

  • Leaking valve. Shut the cock.
• 23

  PS did not open

  lockout

  A pressure switch is still made when it should be open.

  • Welded switch, water in hose, inducer still spinning when it should be off.
• 24

  Secondary fuse open

  warn

  24 V fuse on the IFC.

  • Tstat short, HUM/EAC, valve harness. Replace fuse only after the short is gone.
• 31

  Pressure / draft / aux did not close

  lockout

  Inducer running, prove switch open. On two-stage this is often the active-stage PS.

  • 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.
• 32

  Low-fire / low PS

  lockout

  Low-stage pressure path. Classic attic 926T in wind/ice.

  • Low-fire hose only. Intake termination. Attic PVC slope back to the collector.
  • Do not confuse a live 3 1.6 CFM readout with 32.
• 33

  Limit or rollout open

  warn

  The winter callback. Airflow first.

  • Filter, VS heat CFM (setup switches / model plug), coil, return.
  • Rollout is manual reset — inspect exchanger before you reset.
  • Three minutes → 13.
• 34

  Ignition prove fail

  lockout

  Trial without flame sense. Three strikes → 14.

  • HSI glow and 120 VAC, gas cock, manifold, flame rod oxide, IFC ground.
• 41

  Blower RPM out of band

  lockout

  VS motor too slow/fast vs model plug.

  • Static, wheel, harness, correct model plug, setup SW for AC tons / CF.
• 42

  Inducer RPM out of band

  lockout

  Inducer not at commanded speed.

  • Condensate in the inducer, bad inducer, vent load. Often pairs with 31/32.
• 43

  PS tubing / drain

  lockout

  Blockage or disconnected hose.

  • Trace each hose. Attic jobs grow ice in the vent, not just the hose.
• 44

  Blower calibration

  warn

  CFM learn failed.

  • Filter, 41 also present → motor/static. Wrong A/C or CF switch.
• 45

  Control lockout

  lockout

  IFC parked itself. This is Bryant/Carrier 45 — not Rheem 45 (low PS open).

  • Power reset once after the root code is understood. Repeat 45 = board or persistent input.

Workflows

Test points

Model plug

Must match this 926T cabinet. Missing plug → 21 and garbage CFM.

Flame sense

µA per THIS Bryant door card (typically ≥ 0.5–1.0 µA class).

Setup SW

AC tons and CF affect 41/44 if someone stacked extra cooling.

Gotchas

• 926T aliases used to swallow 927T. They are separate plates now.

Related plates

• carrier-59tp7 — Carrier Performance 97 twin.
• bryant-926t — Preferred 96 two-stage sibling.