FieldBench
Models
Carrierac

24VNA6

Infinity Greenspeed inverter AC

Infinity inverter air conditioner. Outdoor drive + ABCD. No reversing valve and no defrost — that is 25VNA4. Charge is weigh-in. There is no contactor and no dual cap.

Not 25VNA4 (heat pump — RV + defrost). Not 24TPA7 (two-stage Performance, Y1/Y2). Not 24ACC6 / 26SCA5 (contactor + cap). Not 26VNA1 (R-454B Infinity inverter).

Diagnose this modelInstall notesBoard cross-refField wiring

Drive

Inverter scroll · variable capacity · R-410A

Bus

Infinity ABCD to the wall control and indoor

Charge

Weigh-in + line-set. Not a 24ACC6 piston SH chart.

Sister

Bryant 191VAN / 180B · 25VNA4 is the HP twin

This board

Outdoor inverter + Infinity UI — AC only

  • Infinity thermostat events first.
  • Outdoor drive L-codes. There is no defrost sensor to ohm.
  • No conventional Y1/Y2. If you hear a contactor, you are on 24ACC6 / 24TPA7.

Infinity last 10. Outdoor inverter last-fault if the stat is blank.

Universal swap

No universal

Carrier 24VNA6 outdoor. No furnace IFC universal. Replace the OEM outdoor control / contactor / drive by the silk.

Silk: 24VNA6

White-Rodgers

—

ICM

—

Honeywell

—
  • Indoor furnace universals (50A55, 50M56U, ICM282B, ICM2811, S9200U). This is not an IFC.
  • Do not ‘adapt’ a furnace board to an outdoor inverter, defrost PCB, or contactor.

After you pull the dead card

  1. 1Photograph the outdoor silk. Indoor 50A55 / ICM282B / S9200U do not belong here.
  2. 2Contactor units: replace the contactor / cap / HPS — there is no universal outdoor board.
  3. 3Inverter / communicating outdoors: OEM drive only. There is no White-Rodgers or ICM outdoor universal.

Field wiring

Written landings for Carrier 24VNA6. Not a factory schematic.

Infinity / Evolution inverter AC
ABCDR-410A

Four-wire communicating inverter air conditioner. Capacity is serial. No contactor, no dual cap, no reversing valve, no defrost.

Written circuit description only — FieldBench does not redraw maker schematics. Example: R to W closes on a heat call; verify 24V at W1 before you change the IFC.

Open manufacturer PDF

This indoor

Infinity FE/FV / 59MN7 / 59TN6. A 59SC5 + Infinity stat is not this outdoor.

ABCD only

Infinity or Evolution wall control plus a matching indoor.

Infinity / Evolution wall control

Four-wire ABCD. D is 24V hot, not Y.

  • ADataData
  • BDataData
  • C24V common24V
  • D24V hot — not a cool call24V

Infinity / Evolution indoor

Same ABCD. Indoor CFM is serial. A Comfort 59SC5 does not belong here.

  • ADataData
  • BDataData
  • C24V common24V
  • D24V hot24V

Outdoor communicating drive

ABCD (or the outdoor comm harness). No Y contactor. No dual cap.

  • ADataData
  • BDataData
  • C24V common24V
  • D24V hot — still not Y24V

Outdoor line — inverter drive

208/230 into the drive. No contactor slam. DC bus can stay live after the disconnect.

  • L1Line to the driveLine
  • L2Line to the driveLine
  • GNDEquipment groundLine

Landing

  • DataStat A/Bindoor A/Boutdoor A/B

    Data pair. Not 24 VAC Y.

  • 24VStat Cindoor Coutdoor C

    24V common. Still required.

  • 24VStat Dindoor Doutdoor D

    24V hot. D is not Y.

  • LineL1 / L2drive

    208/230. No contactor.

Prove it

  • Wall-control event list first. Bus fault vs drive fault — do not gauge up on a comm code.
  • ABCD landing and polarity. C is still required at the wall control.

Do not

  • Do not land conventional Y on D and walk away.
  • Do not ohm a defrost sensor or an RV solenoid. That is 25VNA4 / 280ANV.
  • Do not change a dual run cap that is not in this cabinet.

Carrier 24VNA6 / 26VNA1 and Bryant 191VAN / 180B. 187B is Evolution two-stage on the same ABCD bus, not this inverter.

Sequence

  1. 1

    Call

    Wall control requests capacity over ABCD. Outdoor inverter ramps. No Y contactor.

  2. 2

    Protect

    HPS / LPS / drive OC. This outdoor never goes into defrost.

Faults on this IFC

Step 1, then 2, then 3. Expected reading and the fail branch sit under each check.

Comm

ABCD / outdoor drop

lockout

Drive or bus. Wall control loses the outdoor.

  1. 1 Let it cool, then read the drive LED

    On Carrier 24VNA6 overcurrent / overheat is often a dirty coil, a failed OD fan, or a locked compressor — not a dead inverter. Clear airflow, confirm the OD fan, and read the drive LED before you order a control. ABCD landing and polarity, outdoor board power, inverter comms harness.

    Expect: OD fan running. Coil clean. Drive LED decoded from THIS outdoor’s card.

  2. 2 Voltage and compressor windings

    Incoming voltage in range (this plate’s line-voltage code). Compressor windings even, no ground. A shorted compressor will kill a new drive. C still required at the wall control.

    Expect: Balanced windings. No winding to ground. Line voltage stable under load.

  3. 3 Charge and the drive last

    A starved or flooded compressor will overcurrent. Confirm SH/SC and charge weight. Only then condemn the inverter. Indoor must be Infinity-capable. A 24ACC6-style indoor pairing is the wrong mental model.

    Expect: Charge on the nameplate. Drive code gone after a cool-down and a clean coil.

HPS / LPS

Pressure protection

lockout

Still real on an inverter.

  1. 1 Let it cool, then read the drive LED

    On Carrier 24VNA6 overcurrent / overheat is often a dirty coil, a failed OD fan, or a locked compressor — not a dead inverter. Clear airflow, confirm the OD fan, and read the drive LED before you order a control. Coil, fan, charge by weigh-in — you do not ‘top off’ a Greenspeed.

    Expect: OD fan running. Coil clean. Drive LED decoded from THIS outdoor’s card.

  2. 2 Voltage and compressor windings

    Incoming voltage in range (this plate’s line-voltage code). Compressor windings even, no ground. A shorted compressor will kill a new drive. Outdoor fan that is actually the inverter-driven fan, not a dual-cap PSC motor.

    Expect: Balanced windings. No winding to ground. Line voltage stable under load.

  3. 3 Charge and the drive last

    A starved or flooded compressor will overcurrent. Confirm SH/SC and charge weight. Only then condemn the inverter. Do not use 24ACC6 piston superheat as the pass/fail.

    Expect: Charge on the nameplate. Drive code gone after a cool-down and a clean coil.

Inverter

Drive overcurrent / overheat

lockout

L5/L4-class faults on the drive.

  1. 1 Let it cool, then read the drive LED

    On Carrier 24VNA6 overcurrent / overheat is often a dirty coil, a failed OD fan, or a locked compressor — not a dead inverter. Clear airflow, confirm the OD fan, and read the drive LED before you order a control. Compressor to ground, heat sink, supply voltage. Weigh-in vs nameplate.

    Expect: OD fan running. Coil clean. Drive LED decoded from THIS outdoor’s card.

  2. 2 Voltage and compressor windings

    Incoming voltage in range (this plate’s line-voltage code). Compressor windings even, no ground. A shorted compressor will kill a new drive. These L-codes do not exist on 24ACC6. If you are looking at a contactor, you are on the wrong outdoor.

    Expect: Balanced windings. No winding to ground. Line voltage stable under load.

  3. 3 Charge and the drive last

    A starved or flooded compressor will overcurrent. Confirm SH/SC and charge weight. Only then condemn the inverter.

    Expect: Charge on the nameplate. Drive code gone after a cool-down and a clean coil.

Workflows

Silent 24VNA6

Infinity calling cool, outdoor not ramping.

  1. 1 Prove the call and the live code

    Stat event list. Bus fault vs drive fault.

    Expect: Write whatever Outdoor inverter + Infinity UI — AC only is showing. Infinity last 10. Outdoor inverter last-fault if the stat is blank.

    If fail: No call at the IFC → stat / harness. Do not change gas parts.

  2. 2 Isolate the first failed step in the sequence

    There is no contactor and no dual cap. Do not change a part that is not there.

    Expect: Protect: HPS / LPS / drive OC. This outdoor never goes into defrost.

  3. 3 Confirm with a number, then the next part

    Weigh-in + line-set. 24ACC6 SH/SC is the wrong finish. If the plate says 25VNA, you are on the heat-pump twin — defrost lives there.

    Expect: Charge: Recover and weigh. Nameplate + ounces/ft. Not piston SH. · ABCD: Communicating to the Infinity indoor / 59MN7 family. D is not Y.

    If fail: Stay on this plate. The out-of-range reading is the part.

    If pass: Reading in range → the next step in this workflow is the repair.

Test points

Charge

Recover and weigh. Nameplate + ounces/ft. Not piston SH.

ABCD

Communicating to the Infinity indoor / 59MN7 family. D is not Y.

Drive

Inverter LEDs / last fault. No contactor coil 24 VAC test.

Gotchas

  • This used to be filed under 25VNA4. That is a heat pump. Do not ohm a defrost sensor on 24VNA6.
  • 26VNA1 is the R-454B Infinity inverter. Different refrigerant.
  • Bryant 191VAN / 180B is the Evolution twin.

Related plates

Install this plate

Install Carrier 24VNA6 as Infinity Greenspeed inverter AC.

Infinity Greenspeed inverter AC

This plate — not the sister SKU

  • Not 25VNA4 (heat pump — RV + defrost). Not 24TPA7 (two-stage Performance, Y1/Y2). Not 24ACC6 / 26SCA5 (contactor + cap). Not 26VNA1 (R-454B Infinity inverter).
  • This used to be filed under 25VNA4. That is a heat pump. Do not ohm a defrost sensor on 24VNA6.
  • 26VNA1 is the R-454B Infinity inverter. Different refrigerant.
  • Bryant 191VAN / 180B is the Evolution twin.

Control on this outdoor

  • Infinity thermostat events first.
  • Outdoor drive L-codes. There is no defrost sensor to ohm.
  • No conventional Y1/Y2. If you hear a contactor, you are on 24ACC6 / 24TPA7.

Hardware

  • Drive: Inverter scroll · variable capacity · R-410A
  • Bus: Infinity ABCD to the wall control and indoor
  • Charge: Weigh-in + line-set. Not a 24ACC6 piston SH chart.
  • Sister: Bryant 191VAN / 180B · 25VNA4 is the HP twin

First fire

  1. 1Stat event list. Bus fault vs drive fault.
  2. 2There is no contactor and no dual cap. Do not change a part that is not there.
  3. 3Weigh-in + line-set. 24ACC6 SH/SC is the wrong finish.
  4. 4If the plate says 25VNA, you are on the heat-pump twin — defrost lives there.

Do not on Carrier 24VNA6

  • Not 25VNA4 (heat pump — RV + defrost). Not 24TPA7 (two-stage Performance, Y1/Y2). Not 24ACC6 / 26SCA5 (contactor + cap). Not 26VNA1 (R-454B Infinity inverter).
  • This used to be filed under 25VNA4. That is a heat pump. Do not ohm a defrost sensor on 24VNA6.
  • 26VNA1 is the R-454B Infinity inverter. Different refrigerant.

Maker literature

FieldBench does not host manufacturer files. Each link opens the maker’s own literature page in a new tab.

  • Carrier residential furnacesLiterature searchProduct pages carry current literature. I/O booklets are typically HVACpartners / dealer.Open manufacturer PDF
  • Carrier HVAC resourcesLiterature searchOwner-facing literature hub. Do not invent a 59-series I/O URL.Open manufacturer PDF
  • Carrier residential furnacesLiterature searchSearch Carrier 24VNA6 on the maker’s literature page.Open manufacturer PDF

Warranty and bulletins

Affected models, serial range, symptom, remedy, date. Maker files open on the manufacturer site.

All bulletins

  • Residential limited warranty

    warranty sheet

    Carrier / Bryant registered heat-exchanger terms

    Current 59-series / Evolution / Preferred registered warranty · Limited warranty certificate

    Open factsOpen manufacturer PDF

  • Dealer portals

    dealer

    Where remaining service letters live

    Current-year service letters not on a public literature page · Maker dealer portal

    Open factsOpen manufacturer PDF