FieldBench

Carrier

59TP7

Furnace · Performance 97 · two-stage · variable-speed · InteliSense

Carrier Performance 97 two-stage VS (current 97% InteliSense plate). Same two-digit 31/32/33/34/41 language as 59TP6 — different AFUE rating plate, different model-plug map. Not Infinity. Bryant twin is 927T.

Not 59TP6 (96.7% Performance — same IFC idea, different plug / rise). Not 59TN7 / 59TN6 Infinity. Not 59SP6 (single-stage Performance).

Maker PDFs

Walk this in Diagnose

This plate

AFUE
Up to 97.0% two-stage condensing
Staging
Two-stage · dual PS · model-plug VS
Control
24V + InteliSense. No ABCD.
Sister SKU
Bryant 927T

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

41 / 21 after a 59TP6 plug

Parts runner grabbed a TP6 model plug.

  1. The plug must say 59TP7 / this cabinet. A 59TP6 plug in a TP7 is 21/41/44.
  2. Then the same 32 attic-trap / 33 static playbook as TP6.
  3. InteliSense on the matching stat is remote data. It does not change 31/33/34.

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

  • 59TP6 is already in the bench. This plate exists so 59TP7 / 927T do not silently open the 96% rise table.
  • A 3 1.6 readout is still live CFM, not code 31.

Related plates