HVAC Motor Cross-Reference: Blower & Condenser Fan Motors

Blower and condenser fan motors are the second-most-replaced parts we sell after capacitors — and the easiest to get wrong. This guide shows you how to identify which of the three motor families you have, decode the OEM part number on the nameplate, and pick a universal replacement that actually works. Every cross printed here is verified against manufacturer documentation or our own parts database. Open To Public HVAC Parts stocks Mars, Century, US Motors, Fasco, TradePro, Packard, and Genteq motors at our Dallas counter — no account needed.

Step 1: Which of the Three Motor Types Do You Have?

Before any cross-reference, identify the motor family. The fastest tell is the plug on the motor — you don’t need to read a single spec to get this right.

Not sure which you have? Snap a photo of the motor and its plugs and text it to (214) 340-9421 — we’ll identify it, usually within minutes during store hours.

Universal Replacements by Motor Type

PSC motors — condenser fan & direct-drive blower

Universal PSC lines we stock and cross to daily: Century MasterFit Pro, US Motors RESCUE (multi-HP, multi-speed), Mars Azure 10860 (digital, covers 1/5–1/2 HP at 115/230 V in one motor with auto-sizing learn mode), and Packard. One RESCUE or Azure motor on the shelf replaces dozens of OEM numbers — that’s why we can usually hand you a condenser fan motor the same day, in stock, while online sellers quote you a week.

Constant-torque ECM (X13 class)

TrueLine — the X13-class line we stock at the counter. It’s Rheem/Ruud’s house brand, private-labeled US Motors RESCUE EZ13 motors, so the cross is exact: W51-MHBDV-04 = US Motors 5632 (1/3–1/2 HP), W51-34BDV-04 = 5642 (3/4 HP), W51-11BDV-04 = 5652 (1 HP) — all 115/208-230 V, 1075 RPM class. TradePro TP-EC13 (TP-EC13-50 / -75 / -1) covers the same class — if that’s the number you were quoted, we’ll cross it to what’s on the shelf. US Motors RESCUE Select covers the same class and is field-adjustable per US Motors’ literature. Genteq Evergreen EM is the brand-name option — the current EM line is dual voltage (115/208-230 V in one motor), pre-programmed, with automatic rotation sensing. Verified from Regal Rexnord’s current catalog:

Decoder tip for the older single-voltage Evergreen EM “E” series you may still find on shelves or in units: 61xx = 115 V, 62xx = 208-230 V, and the last two digits are the horsepower (03 = 1/3 … 10 = 1 HP). Genteq has discontinued the E series in favor of the dual-voltage X series above.

Variable-speed ECM (constant airflow)

The Genteq Evergreen VS line replaces GE/Genteq variable-speed models 2.0, 2.3, 2.5, 3.0, and Eon. Current stock numbers sell the motor and the required user interface together in one box:

Source: Regal Rexnord Evergreen VS catalog pages, checked July 2026. Accessories: 5K010V user interface (sold separately if needed), 5K015 16-to-4-pin adapter for model 2.5, 5K016 rotation-reversing harness (rarely needed — the motor auto-configures rotation).

Mars 10857 — the other variable-speed universal we stock: a multi-horsepower (1/2–1 HP, 120/240 V, 1075 RPM class) ECM replacement that covers most model 2.0, 2.1, and 2.3 motors — the ones with the 16-pin low-voltage harness. Goodman’s ProParts PP857 is the exact same motor in a private label, so if you were quoted a PP857, we can hand you the equivalent today.

The Selection Rule (Memorize This)

OEM Part Number Decoders

Every equipment brand hides the same information in a different numbering system. Here’s how to read the six systems we see most at the counter. Crosses shown are verified in our parts database.

Trane / American Standard — D-numbers and MOT numbers

Trane parts carry two kinds of numbers. Service prefixes (MOT, CPT, CTR…) tell you the part type reliably. D-numbers (D######P##) are factory drawing numbers and tell you nothing about part type — in our database, D-numbers span 14 different part types, from motors to sheet metal to condensate pans. Never assume a D-number is a motor. We verified prefix reliability across 170,000+ Trane supply records:

⚠ CNT and MOD prefixes are NOT type-safe (barely half of each is what you’d guess) — always look those up. Verified motor crosses from our database: MOT03771 → Fasco D2850 · MOT09188 → Fasco D2851 · MOT-1876 → Century 952. For D-numbers, use the lookup table below.

Rheem / Ruud — 51- numbers

Motor part numbers start with 51- (e.g., 51-23055-11, a 1/5 HP 1075 RPM condenser fan motor that crosses to US Motors RESCUE 5454 or Century ORM5458). Watch for one trap: Rheem dual-sources motors, so the same 51- number may arrive built by US Motors or by Genteq — always match specs from the nameplate, not the housing shape. The 51-106542 series is Rheem’s SelecTech-based ECM blower family (replace per the ECM rule: HP + voltage). As an authorized Rheem dealer we stock or can quickly source most 51- motors.

Lennox — catalog numbers and grid codes

Lennox uses two formats: long numeric catalog numbers like 101154-01 or 65204100 (verified crosses: 101154-01 → Fasco A320, 65204100 → Fasco A206), and short “grid” codes like 34W69 or 60L22. Neither format encodes specs — they’re lookup-only. And careful: a grid code isn’t necessarily a motor at all (94W83 is an ignition board — see below).

Carrier / Bryant / Payne — HC and HD numbers

HC numbers are fan and condenser motors (the most famous being HC39GE237); HD numbers are direct-drive ECM blower motors. The letters after HC encode the frame series, not specs. Verified crosses from our database: HC24AU600 → Fasco D456 · HC24AU700 → Fasco D457.

York / Coleman / Luxaire — S1- numbers

Johnson Controls brands prefix everything with S1-. One genuinely useful pattern from our database: S1-FHM#### numbers are Genteq-built motors where the digits ARE the Genteq model (S1-FHM3727 → Genteq 3727, S1-FHM3730 → Genteq 3730). The S1-024-#####-### format encodes nothing — lookup only. MARS builds the largest share of York universal crosses (345 mappings in our database).

Goodman / Amana / Janitrol — 0131M numbers

Blower and condenser motors start with 0131M (e.g., 0131M00121 → MARS 10552, 0131M00002P → MARS 10553 or Fasco A065 — both database-verified). A trailing S means a later factory revision of the same part. Goodman’s factory-programmed ECM motors (like 0131M00271S) should be replaced by OEM number so the airflow program matches.

Wait — Is Your Number Even a Motor?

ECM Control Modules: Sometimes You Only Need the “Brain”

On ECM motors, the motor half and the control module half fail independently — and the module is usually what dies. Three different rules apply:

Variable-speed 2.3 / Eon: the control module unbolts from the motor and carries the OEM airflow program inside it. Buy the module by the OEM part number (Trane D341314Pxx family, Lennox 39L29xx, Carrier HD-series module numbers) so your furnace gets the exact airflow profile it was engineered for. A generic module will run the motor but move the wrong amount of air.

X13 class (constant torque): Genteq’s answer is the Evergreen EM control module — “save the motor, replace the control.” Modules 6203ECTL (1/3 HP), 6205ECTL (1/2), 6207ECTL (3/4), 6210ECTL (1 HP), all 208-230 V, pre-programmed with auto rotation sensing; match HP and voltage to the old control. Two bolts, motor stays in the blower housing. (115 V X13 systems: replace the whole motor — see the matrix above.)

Variable-speed 2.5: new OEM 2.5 modules are effectively out of production. Your realistic options: the Evergreen VS kit with the 5K015 adapter (new, stocked path), or a remanufactured module from a specialty rebuilder (ships in days, nothing same-day). We’ll tell you straight which is cheaper for your unit. And check the caveat above first: on 2.5 and 3.0 systems whose board uses model programming or a model plug, only the OEM motor or module will communicate — universals will error out.

The Motors Everyone Asks About

Carrier HC39GE237 / HC39GE237A

The highest-volume condenser fan motor cross in the business: a 1/4 HP, 1100 RPM, 208-230 V motor. Its Genteq factory model is 5KCP39EGS070S, and the standard replacement is Genteq 3905 (database-verified cross) — or any universal PSC matched to those specs. Bring the old run capacitor so we can match µF while you’re here.

GE/Genteq 5SME39SL0253 (= Lennox 39L2901 family)

A 1 HP ECM 2.3 variable-speed blower motor. The same physical motor appears as Lennox 39L2901/39L29/18M8101 and in the Trane D341314P03 module family. Replace the module by OEM number (the program lives in the module), or convert with an Evergreen VS kit.

Rheem/Ruud 51-23055-11

1/5 HP, 1075 RPM, 208-230 V condenser fan motor used across a decade of Rheem/Ruud condensers. Database-verified crosses: US Motors RESCUE 5454 and Century ORM5458.

Goodman 0131M00271 / 0131M00271S

A 3/4 HP, 120/240 V factory-programmed ECM used across Goodman/Amana equipment. Because the airflow program is baked in, replace by OEM number — there’s no generic drop-in. We can source it and have you running fast.

Trane D-Number Lookup Table (116 Verified Numbers)

Because Trane D-numbers don’t reveal part type, we published every D-number in our verified data — motors first, then everything else — with type, key specs, and known crosses. Zero type disagreements across sources. If your D-number isn’t here, that doesn’t mean it’s unavailable: text it to (214) 340-9421 and we’ll cross it against the counter system.

⚠ marks specs pending a second-source review. Sources: manufacturer cross-reference catalogs, distributor listings, and our parts database.

Before You Pull That Motor

Frequently Asked Questions

Do I need to match RPM when replacing an ECM blower motor?

No. For X13-class and variable-speed ECM replacements, match horsepower and voltage only — the manufacturer selection guides state RPM and FLA do not need to match, because the electronics control the speed. PSC motors are the opposite: RPM must match exactly.

Can I replace an X13 (ECM) motor with a cheaper PSC motor?

Physically it can be made to fit, but we don’t recommend it: you lose the soft-start, the efficiency the system was rated with, and the 24 VAC tap control your furnace board expects — which means rewiring and usually a nuisance-tripping blower. Universal X13 replacements have come down enough in price that the swap rarely pays.

My new condenser fan motor spins the wrong way. Did I buy the wrong motor?

Probably not. Most universal PSC motors are reversible — swap the rotation leads per the wiring diagram on the label. Genteq Evergreen motors sense rotation automatically. If the blade still blows the wrong direction, the blade may be flipped on the shaft.

Why does my Trane part number start with D instead of MOT?

D-numbers are Trane factory drawing numbers and cover every part type in the cabinet, not just motors. Use the D-number lookup table above, or text us the number — a MOT service number usually exists for the same part.

Can you test my old motor to confirm it’s actually dead?

Yes — free. We bench-test motors, capacitors, contactors, and boards at the counter while you wait. About a third of “dead motor” walk-ins turn out to be a failed run capacitor, which is a $15 fix instead of a $150 one. Start with the capacitor chart if your motor hums but won’t start.

Other free references we trust: Genteq Evergreen EM selection guide • Genteq Evergreen VS selection guide • Evergreen EM control modules. For step-by-step swap instructions, see our guides on replacing a blower motor and replacing a condenser fan motor.