FieldBench

Bryant

926T

Furnace · Preferred 96 · two-stage · variable-speed · InteliSense

Bryant Preferred 96 two-stage furnace (factory twin of Carrier 59TP6). Two-digit IFC: 31, 32, 33, 34, 41, 42…. Model plug required. InteliSense is remote data to an ecobee-for-Bryant — it is not Evolution ABCD. 925T is the previous Preferred two-stage plate (same 31/32 language).

Not 987M Evolution modulating (ABCD, pressure band). Not 986T / 987T Evolution two-stage (ABCD bus). Not 926S (single-stage Preferred — one PS, no W2). Not 916S Legacy flash-look Comfort 96. A 926T will not become an Evolution furnace by swapping the stat.

Walk this in Diagnose

This plate

AFUE
Up to 96.7% · two-stage condensing
Staging
Two-stage gas · two-speed inducer · dual pressure switches
Blower
Variable / 25-speed ECM · model plug + setup switches
Control
Two-digit Preferred IFC · 24V thermostat · optional InteliSense
Tstat
Conventional 24V W1/W2. InteliSense is dealer data, not ABCD.
Sister SKU
Carrier 59TP6 same IFC · 927T current Preferred two-stage refresh

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

33 / 13 overheating

Most common 926T winter call.

  1. Is it 33 (live) or 13 (lockout)? 13 needs the 3-hour wait or a power cycle after the cause is fixed.
  2. Read heat CFM / setup, not a Goodman 9-speed tap — this motor is VS with a model plug.
  3. Model plug present and correct for the cabinet? Wrong plug = 21 and a 33 that never dies.
  4. TES vs the 926T / 59TP6 blower chart. Media cabinets and downsized returns are the usual.
  5. Rollout portion of the 33 circuit: if the rollout is open, stop and inspect.

32 with 34

Attic 926T, no heat. These are different faults.

  1. 32 is draft at low fire. 34 is ignition prove. Fix 32 first or you will never get a fair 34 test.
  2. Trap and PVC slope in the attic.
  3. Then HSI and rod. 34 repeating becomes 14.
  4. Do not add a hard-start — this is not the outdoor.

Which Bryant 96% is this?

Plate is dirty or the last tech said ‘it’s a Bryant 96.’

  1. 926T / 927T = Preferred two-stage, 24V, model plug, 32 exists. Stay here.
  2. 926S = Preferred single-stage. One PS. Leave this page.
  3. 986T / 987T = Evolution two-stage, ABCD wall control. Leave this page.
  4. 987M = Evolution modulating. 31 is a band. Leave this page.
  5. 916S / 915S = Legacy single-stage Comfort-style. Leave this page.

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

  • Carrier 59TP6 is the factory twin — same two-digit card. 987M is not.
  • Bryant 45 is control lockout. Rheem 45 is low-pressure open. Do not mix those.
  • A display of 3 1.6 is often live airflow, not code 31.
  • Replacing the IFC without moving the model plug is how you create a 41/44 ghost.

Related plates

  • carrier-59tp6 — Carrier factory twin. Same 11–45 two-digit IFC and model-plug motor.
  • bryant-927t — Preferred 97 two-stage. Same 31/32 language, different plug and 97% rise table.
  • bryant-926s — Preferred 96 single-stage. One PS, no W2. Do not apply 32-as-low-fire.
  • bryant-986t — Evolution two-stage. ABCD bus. Same two-stage gas, different control.
  • bryant-987m — Evolution modulating. 31/42 is a pressure band, not 32.