FieldBench

Carrier

59SP6

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

Carrier Performance single-stage VS 96% (59SP6 current, 59SP5 previous). One solenoid, one PS, VS / 25-speed blower. Two-digit IFC. 32 is not low-fire — there is no high fire. Bryant twin is 926S.

Not 59TP6 / 59TP7 (two-stage, dual PS, W2). Not 59SC5 / 59SC6 Comfort (no Performance VS plug story). Not Infinity.

Maker PDFs

Walk this in Diagnose

This plate

AFUE
Up to 96–97% single-stage condensing
Staging
Single-stage · one PS
Blower
VS / 25-speed · setup, not a TP6 two-stage plug map
Sister SKU
Bryant 926S · 59SP5 previous Performance single-stage

This board

Preferred two-digit IFC · single-stage

  • Same 11–14, 21–24, 31, 33, 34, 41, 45 family as other Bryant/Carrier two-digit boards.
  • One draft switch. 31 is that switch. Door-card 32, if printed, is still the only PS — not a 926T low-fire path.
  • No W2 furnace terminal that means high fire. A leftover W2 is unused or an AC stage.

Sequence

  1. W. Inducer → single PS must close (31 if not) → HSI → valve → flame (34) → VS blower.
  2. No W2 path. There is no high-fire prove and no second solenoid.

Faults on this IFC

  • 13 / 33

    Limit / lockout

    warn

    Airflow or rollout. 13 is the hardened 33.

    • VS heat CFM / setup — not a 9-speed tap.
    • Filter, coil, return. Rollout is manual reset.
  • 14 / 34

    Ignition

    lockout

    No flame prove. 14 is the hardened 34.

    • HSI, gas, rod, ground.
  • 24

    Fuse

    warn

    24 V fuse open.

    • Tstat short, HUM/EAC, valve harness.
  • 31

    PS / draft

    lockout

    The only pressure switch did not close.

    • Trap, collector, PVC, wind, inducer. One hose, one switch.
    • Do not hunt a high-fire hose.
  • 41 / 44

    Blower RPM / calibration

    lockout

    VS motor vs setup.

    • Static, filter, correct setup for the coil tons.
  • 45

    Control lockout

    lockout

    IFC parked. Not Rheem 45.

    • Find the root two-digit first.

Workflows

31 on 59SP6

Inducer running, no light.

  1. One pressure switch. Do not pull a 59TP6 dual-hose card.
  2. Trap / PVC / attic ice — still 96% condensing.
  3. 59SC5 is Comfort, not this Performance VS motor.

Test points

Pressure switch
One NO switch. Closed only after inducer is up.
Manifold
Single-stage plate value — no low/high pair.

Gotchas

  • 59SP5 was incorrectly aliased under 59TP6. It is single-stage. This is the correct plate.
  • 59SC6 18-speed Comfort is not this Performance VS IFC.

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