FieldBench

Carrier

59TP6

Furnace · Performance 96 · two-stage · variable-speed

Carrier/Bryant Performance 96 two-stage VS furnace. Two-digit status codes on the IFC (31, 32, 33, 34, 41, 42…). Model plug required. This is not Infinity ABCD communicating, even though the motor is variable-speed.

Not 59MN7 / 59TN6 Infinity (ABCD data bus, modulating or communicating-only). Not 58CVA (80% Infinity). Not a 2-flash Comfort 80 board — 59TP6 uses two-digit codes, and a display like 3 1.6 can be live CFM, not code 31.

Maker PDFs

Walk this in Diagnose

This plate

AFUE
Up to 96.7%
Staging
Two-stage gas · two-speed inducer
Blower
Variable-speed ECM with model plug / setup switches
Control
HK-series / InteliSense-capable IFC · 24V thermostat
Sister SKU
Bryant 926T · Payne/ICP siblings exist

This board

Two-digit IFC status (not Infinity ABCD)

  • Codes are two digits: 13, 14, 23, 24, 31, 32, 33, 34, 41, 42, 43, 44, 45.
  • On VS models 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 the door.
  • Amber/status LED flash charts on older 58MCA-style boards do NOT apply.
  • InteliSense (when enabled with the matching stat) is remote data — it does not change the 31/33/34 meanings.

Sequence

  1. W/W1. Inducer low → low-fire pressure switch (31/32 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 59TP6 cabinet. Wrong plug = wrong CFM and false 41/44.
    • 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. Common on attic 59TP6 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.
    • If flame dies during blower-on delay the IFC may run a 90 s recycle.
  • 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.

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

Workflows

33 / 13 overheating

Most common 59TP6 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 9-speed tap — this motor is VS.
  3. Model plug present and correct for the cabinet? A 100k plug in an 80k cabinet overfires and limits.
  4. TES vs the 59TP6 chart. Media cabinets and downsized returns are the usual.
  5. Rollout portion of the 33 circuit: if the rollout is open, stop and inspect. Do not keep resetting.

32 with 34

Attic 59TP6, 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. A trap that works in the basement will freeze or dry-siphon in the attic.
  3. Then HSI and rod. 34 repeating becomes 14.
  4. Do not add a hard-start or change the capacitor — this is not a condensing-unit call.

Test points

Model plug
Must match the 59TP6 cabinet. Missing plug → 21 and garbage CFM.
Flame sense
µA per Carrier door card (typically ≥ 0.5–1.0 µA class).
Setup SW
AC tons and CF (continuous fan) affect 41/44 if someone stacked extra cooling.

Gotchas

  • A display of 3 1.6 is often live airflow, not code 31. Watch whether it is flashing a fault or reporting CFM.
  • Bryant 926T uses this same two-digit chart. Infinity 59MN7 does not.
  • Replacing the IFC without moving the model plug is how you create a 41/44 ghost.

Related plates

  • bryant-926t — Bryant Preferred 96 factory twin. Same 11–45 two-digit IFC. Type 926T on Diagnose, not this Carrier plate.
  • carrier-59tp7 — Performance 97 two-stage. Same 31/32, different model plug and 97% rise.
  • carrier-59sp6 — Performance single-stage VS. One PS, no W2.
  • carrier-59sc5 — Comfort 96 single-stage — one PS, no W2 furnace path. A 32 there is not TP6 low-fire.
  • carrier-59tn6 — Infinity two-stage 96% — ABCD bus. Same two-stage gas, different control. A TP6 does not become a TN6 by swapping the stat.
  • carrier-59mn7 — Infinity modulating — inducer/pressure BAND, not discrete 31/32 switches.