Trane & American Standard Part Number Decoder
What the three-letter prefixes mean, why CNT5482 and CNT05482 are the same part, and how to find your number when it is nowhere on the part.
READ THIS BEFORE YOU CALL
This chart is a free reference tool, here for you to use on your own. Open To Public HVAC Parts is a walk-in parts counter in Dallas, Texas.
- In-store sales only — no shipping, no online orders.
- We cannot look up or cross parts over the phone or by email.
If you are local, bring the old part and your unit model number to 10226 Plano Rd, Suite 104, Dallas TX and we will work through it with you at the counter.
Trane and American Standard service parts are numbered three letters plus five digits — CNT05482, BLW00889, FAN04073. The letters tell you what kind of part it is. The digits are just a serial. And the single most common reason people cannot find their part is the zeros.
The zero rule — read this first
CNT5482 and CNT05482 are the same part. So are BLW0889 and BLW00889, KIT3033 and KIT03033, FAN4073 and FAN04073, IGN0145 and IGN00145.
Trane’s official format is always five digits after the prefix. But Trane stamps the short version on the part itself, and that is what ends up on invoices, in parts lists and in your search bar. If your part shows four digits, put a zero in front. If it shows three, put two zeros in front.
There is no ambiguity in doing this. Every number is exactly five digits, so a four-digit number can only pad back one way. CNT5482 cannot mean anything except CNT05482.
Finding your number when the part does not have one
- Look for three letters and digits — that is the orderable number. If you have it, you are done.
- No luck? Look for a “D” number like D341213P01. That is Trane’s engineering number and it is very often the only Trane marking physically on the part.
- Look for the actual manufacturer’s number — White-Rodgers, Fasco, Genteq and US Motors build most of these, and their own number is usually printed right on it.
- Failing all of that, get the unit model number off the data plate and work forward from the equipment.
On this page
What the three letters mean
The prefix is the part category. These are the ones we can verify against Trane’s own catalog descriptions — we have deliberately left out prefixes we could not confirm rather than guess at them.
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| Prefix | Means | What it actually is |
|---|---|---|
| CNT | Control | Furnace controls, defrost controls, ignition controls. Not strictly boards — see the warning below. |
| BRD | Board | PCB assemblies. This is the true “board” prefix. |
| CTR | Contactor | Contactors. |
| BLW | Blower | Inducer, draft and combustion blower assemblies. |
| MOT | Motor | Blower motors, condenser fan motors, ECM motor and module sets. |
| FAN | Fan | Fan BLADES — the propeller, not the motor. |
| WHL | Wheel | Blower wheels and squirrel cages. |
| IGN | Ignitor | Hot surface ignitors and spark electrodes. |
| KIT | Kit | Multi-piece service kits — ignitor kits, inducer kits, LP conversion kits. |
| SEN | Sensor | Flame sensors, coil and defrost sensors, thermistors. |
| SWT | Switch | Pressure switches, door interlocks, limit switches. |
| THT | Thermostat / thermal | Limit thermostats, thermal cutouts, terminator switches. |
| VAL | Valve | Gas valves, expansion valves, EEVs, reversing valves. |
| CPT | Capacitor | Run and start capacitors. |
| RLY | Relay | Relays, time delay relays, start relays. |
| TRR | Transformer | Control transformers. |
| MOD | Module | Ignition modules, motor control modules, ReliaTel modules. |
| COM | Compressor | Compressors. |
| BNR | Burner | Inshot burners. |
| HTR | Heater | Crankcase heaters, electric heaters. |
| DHY | Dehydrator | Liquid line filter-driers. |
| FUS | Fuse | Fuses and fusible links. |
| GKT | Gasket | Gaskets. |
| WIR | Wire | Wiring harnesses. |
| PAN | Pan | Drain pans. |
| CHG | Charger | Field charger assemblies. |
FAN is a fan blade, not a fan motor. FAN04073 is a 28-inch aluminium propeller. The condenser fan motor would be a MOT number. This is the easiest wrong part to order on the whole list.
CNT means “Control,” not “control board.” It is a board about nine times out of ten, but the CNT range also contains gas valves and ignition controls. If you specifically want a board, BRD is the prefix that always means one.
There are another seventeen prefixes that definitely exist in Trane’s catalog — ADP, BKR, COL, COR, ELC, ELM, HLD, INS, LAT, ORF, PMP, PNL, RCK, RSR, SHE, TER, TUB — but we could not find a source stating what they stand for, so we are not going to invent expansions for them. Note also that XFR, DFR, FLT, HEA, SEC and PRD are not Trane prefixes, even though they look like they should be. Transformers are TRR, defrost controls are CNT, filter-driers are DHY.
Why one part has four different numbers
This is the thing that makes Trane parts genuinely harder to source than most brands, and almost nobody explains it. A single Trane part can carry four numbers, and only one of them can be ordered.
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| Number | Example | Where you find it | Can you order it? |
|---|---|---|---|
| Service part number | CNT06585 | Trane catalog, parts lists, invoices | Yes. This is the one. |
| Trane engineering number | D343687P02 | Printed on the part | No — cross-reference only |
| OEM manufacturer number | 50V54-571-01 | Printed on the part by whoever actually built it | No — but it is how you find the aftermarket equivalent |
| “X” number | X13690250550 | On some boards and inducers | No — cross-reference only |
The practical consequence
The CNT or BLW or MOT number is frequently not printed on the physical part at all. White-Rodgers, Fasco, Genteq and US Motors build these parts for Trane, and the part carries their number plus a D-number. The Trane service number lives in the catalog, not on the brass.
So if you have pulled a board out of a Trane furnace and there is no CNT number anywhere on it, nothing is wrong. Work from the D-number or the manufacturer’s number instead — or bring the part and the model number to the counter.
It also means aftermarket cross-references are usually published against the D-number, not the CNT number. If searching CNT05165 gets you nowhere, search D341213P01.
Trane and Ameristar parts we stock20 numbers
Both spellings of every number, because you will see it written either way. OEM means the genuine Trane part; aftermarket direct means a different manufacturer’s part that is a direct functional replacement.
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| Trane number | Short form | What it is | What we carry |
|---|---|---|---|
| CNT09646 | CNT9646 | Integrated furnace control board, S8X1 series | OEM Trane |
| CNT09648 | CNT9648 | Integrated furnace control board, A801X (RunTru) | OEM Trane |
| CNT07737 | CNT7737 | Integrated furnace control, constant torque (X13) furnaces | OEM Trane |
| CNT05482 | CNT5482 | Heat pump defrost control board | OEM Trane |
| CNT05001 | CNT5001 | Universal heat pump defrost control, 24VAC | OEM Trane |
| CNT05165 | CNT5165 | Integrated furnace control, 80V hot surface ignitor | Aftermarket direct — White-Rodgers 50A65-5165 |
| CNT03797 | CNT3797 | Integrated furnace control, 120V hot surface ignitor | Aftermarket direct — White-Rodgers 50A55-3797 |
| BRD05765 | BRD5765 | Main control board PCB — Ameristar air handler | Aftermarket |
| RLY02807 | RLY2807 | Fan control board / time delay relay | White-Rodgers 57T01-843 |
| BLW00889 | BLW0889 | Inducer motor assembly, 1-stage, 1/50 HP, 115V | Aftermarket direct — FB-RFB337 |
| IGN00145 | IGN0145 | Hot surface ignitor, nitride, 80V | White-Rodgers 768A-815 |
| IGN00152 | IGN0152 | Hot surface ignitor, nitride, 120V | Aftermarket direct — Supco SSN087KS |
| KIT03033 | KIT3033 | Ignitor kit, hot surface | Aftermarket direct — Supco SKIT03033 |
| SEN01114 | SEN1114 | Flame sensor | Trane |
| FAN04073 | FAN4073 | Fan blade — 3 blade, 28″, 18° pitch, CCW, hub on intake | In stock |
| FAN06720 | FAN6720 | Fan blade — 3 blade, 23″, CCW, hub on intake | In stock |
| VAL09030 | VAL9030 | Furnace gas valve, 2-stage, fast open, 1/2″ | In stock — supersedes VAL06376 and VAL08027 |
| SWT01714 | SWT1714 | Door interlock switch — also fits Carrier and York | In stock |
| SWT02173 | SWT2173 | Manual limit switch, tear drop, L310° | In stock |
| SWT04232 | SWT4232 | Dual pressure switch, −0.17″ / −0.50″ | In stock |
Supersessions — old numbers rolled into new ones
Trane supersedes aggressively, and it goes one direction: one new number absorbs several old ones. Always look your number up as a “replaced by” rather than assuming the old one is still made.
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| Old numbers | Replaced by | Part |
|---|---|---|
| CNT03076 · CNT03798 · CNT05164 | CNT05165 | Integrated furnace control, 80V HSI |
| CNT07639 · CNT07872 | CNT09646 | Integrated furnace control, S8X1 |
| CNT07940 | CNT09648 | Integrated furnace control, A801X |
| CNT04711 | CNT07737 | Integrated furnace control, constant torque |
| CNT02789 · CNT02891 · CNT03799 | CNT03797 | Integrated furnace control, 120V HSI |
| VAL06376 → VAL08027 | VAL09030 | Furnace gas valve, 2-stage |
| BLW00473 · BLW00522 · BLW01312 · BLW01437 | BLW00889 | Inducer assembly |
| IGN00051 · IGN00052 · IGN00053 · KIT02863–KIT02865 | KIT03033 | Ignitor kit |
| IGN00104 · IGN00117 | IGN00145 | Hot surface ignitor, 80V |
| IGN00146 | IGN00152 | Hot surface ignitor, 120V |
| FAN03127 · FAN04003 | FAN06720 | Fan blade, 23″ |
| BRD04300 | BRD05765 | Main control board PCB |
| CTR00205 · CTR00208 · CTR00248 · CTR00260 and more | CTR02573 | Contactor, 2-pole 30A — one part replacing a dozen |
Aftermarket equivalents
These are published crosses, not guesses. In most cases the aftermarket manufacturer is the company that built the Trane part in the first place, which is why the crosses are reliable.
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| Aftermarket part | Maker | Crosses to Trane | Part type |
|---|---|---|---|
| 50A65-5165 | White-Rodgers / Copeland | CNT05164, CNT05165 | Integrated furnace control, 80V HSI |
| 50A55-3797 | White-Rodgers | CNT02789, CNT02891, CNT03799 | Integrated furnace control, 120V HSI |
| 50H47-475-02 | White-Rodgers | CNT09647 | Integrated furnace control PCB |
| 57T01-843 | White-Rodgers | RLY02807 / CNT05981 | Time delay relay / fan control |
| 36J54-214 | White-Rodgers | VAL06376, VAL08027, VAL09030 | Furnace gas valve |
| 768A-815 | White-Rodgers | IGN00145 | Hot surface ignitor, 80V |
| SSN0145 | Supco | IGN00145 | Hot surface ignitor, 80V |
| SSN087KS | Supco | IGN00152 | Hot surface ignitor, 120V |
| SKIT3033 | Supco | KIT03033 | Ignitor kit |
| W51-11BDV-04 | US Motors / Genteq | MOT13129 (D672365P11) | ECM X13 blower motor, 1 HP |
| A369 | Fasco | BLW00521 | Inducer assembly |
| 70218928 | Fasco | BLW00451 | Combustion blower |
| 66311 | Packard | BLW01311 (D965130P01) | Inducer assembly |
| ICM2812-KIT, ICM2913 | ICM Controls | Various — ICM keeps a dedicated Trane board category | Furnace control boards |
The pattern worth knowing: aftermarket crosses for Trane are almost always published against the D-number rather than the CNT or BLW number, because White-Rodgers, Fasco and Genteq know the part by the engineering number they built it to. A cross search that fails on the service number will often succeed on the D-number.
Genuinely universal categories, where aftermarket wins on price and availability: capacitors, contactors, relays, transformers, ignitors, flame sensors, door switches, fuses and gaskets. The SWT01714 door switch literally crosses to Carrier and York. Largely closed categories where you are mostly buying Trane: boards, inducer assemblies, ECM motor and module sets, fan blades, gas valves and coils.
Trane, American Standard, Ameristar and RunTru
Four badges, one company, one parts catalog. This confuses people constantly, so here is the map:
← Swipe the table sideways to see every column →
| Badge | Tier | Model prefixes | Parts |
|---|---|---|---|
| Trane | Premium | 4TTR / 4TTV / 4TTL (AC), 4TWR / 4TWV (heat pump), S8X1 / S9X1 / S9V2 (furnace), TAM / TEM (air handler). Older: 2TTR, TUD, TDD, TUH | The base catalog |
| American Standard | Premium — same equipment, different badge | 4A7A / 4A7V (AC), 4A6V / 4A6H (heat pump), S8X / S9X (furnace). Older: AUD, ADD, AUH | Identical part numbers. There is no separate American Standard service numbering. |
| RunTru by Trane | Value | A801X, A951X and similar | Same prefix system. CNT09648 is the A801X board. |
| Ameristar by American Standard | Value | M4AC4 (AC), M4HP4 (heat pump), M4AH4 (air handler), M801P (furnace), M4CX (coil) | Same prefix system, routed through Trane Supply. BRD05765 is an Ameristar board. |
On Ameristar parts specifically
Ameristar furnace parts and control boards use the same three-letter Trane numbering and come through the same catalog. Generic components — contactors, capacitors, ignitors, flame sensors, blower motors — interchange with Trane by specification.
But do not assume a Trane part fits an Ameristar unit just because the brands are related. The value brands use cost-reduced boards and blowers carrying their own numbers, and there is no published Trane-to-Ameristar cross-reference table. Match on the part number and the physical specification, not on the badge.
Trane’s marketing tiers are XR (base), XL (mid), XV (variable speed) and XC (top). American Standard calls the same boxes Silver, Gold and Platinum. “Service First” is Trane’s own OEM parts brand — if a customer says Service First, they mean genuine Trane.
Reading the unit model number
When the part number is gone, the model number gets you there. Trane’s outdoor unit numbering is one of the more readable in the industry:
4 T W R 6 036 A 1 0 0 0 B
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| Position | Meaning | Values |
|---|---|---|
| 1 | Refrigerant | 4 = R-410A · 2 = R-22 (older equipment) |
| 2 | Brand | T = Trane · A = American Standard |
| 3 | Product type | T = split air conditioner · W = split heat pump · X = coil |
| 4 | Family | R = XR · L = XL · V or Z = XV |
| 5 | SEER | 6 = 16 SEER, and so on |
| 6–8 | Nominal capacity | BTU divided by 1000. 018 = 1.5 ton, 024 = 2, 030 = 2.5, 036 = 3, 042 = 3.5, 048 = 4, 060 = 5 |
| 9–14 | Connections, revision, parts identifier | Not needed for most lookups |
The data plate lives on the top right of the back of an outdoor unit, on a side panel on a furnace, on the front panel of an air handler or coil, and on the rear door of a packaged unit.
Questions we get at the counter
Is CNT5482 the same as CNT05482?
Yes. Trane numbers are always five digits after the prefix, so a four-digit version is just the same number with the leading zero dropped. Trane prints the short form on the part itself, which is why both are everywhere. The same goes for BLW0889 and BLW00889, FAN4073 and FAN04073, KIT3033 and KIT03033.
There is no Trane number anywhere on my part. Did somebody replace it already?
Probably not. The CNT, BLW or MOT number often is not printed on the part at all — it lives in Trane’s catalog. What is on the part is a D-number like D341213P01 and whatever number the actual manufacturer put there, usually White-Rodgers, Fasco or Genteq. Work from either of those, or from the unit model number.
Is a Trane part the same as an American Standard part?
Yes, identically. Same company, same equipment, same service part numbers. Only the model numbers on the outside of the box differ — Trane uses a T in the model prefix and American Standard uses an A.
Do Ameristar parts have their own numbers?
No, Ameristar uses the same three-letter Trane numbering and comes through the same catalog. That said, the value brands use some cost-reduced boards and blowers with their own part numbers, so match on the number rather than assuming a Trane part fits.
My board is discontinued and Trane has no replacement. Now what?
That happens often with the older CNT range. It is what the White-Rodgers universal boards are for — the 50A65-5165 covers the 80V ignitor controls and the 50A55-3797 covers the 120V ones. Fitting one is not a compromise when the OEM part no longer exists, but the harness and the configuration matter as much as the board, so bring the old one.
Why does a search for my CNT number find nothing?
Two likely reasons. Either you need the zero — try the five-digit version — or the cross you want is published against the D-number instead. The companies that build these boards catalogue them by their own numbers, not by Trane’s.
Is FAN04073 a fan motor?
No, and this is the most common mis-order on the whole list. FAN is the prefix for fan blades. FAN04073 is a 28-inch three-blade aluminium propeller. A condenser fan motor would carry a MOT number.
Bring the old part in
Open To Public HVAC Parts — 10226 Plano Rd, Suite 104, Dallas, TX. Walk-in counter, open to homeowners and contractors alike since 1998. Bring the part and your unit model number and we will work out what it is with you at the counter, including when the Trane number is nowhere on it.
We stock Trane and Ameristar control boards, defrost boards, ignitors and ignitor kits, flame sensors, inducer assemblies, fan blades, gas valves, limit and pressure switches, plus the White-Rodgers universal boards for the discontinued ones. We test capacitors, contactors, motors, ignitors, relays and transformers free while you wait.
In-store only. We do not ship and we cannot cross parts over the phone.
Sources: Trane 4TWR6 (XR16) product data, model nomenclature section; Trane service part descriptions as republished by Trane distributors; Trane Supply and Trane Technologies support documentation; Copeland/Emerson White-Rodgers installation instructions 37-7516001 (50A65-5165); Jackson Systems and Emerson cross-reference data for 50A55-3797; Supco, Fasco, Packard, US Motors and ICM Controls product literature; Ameristar M4HP and M4AH installation instructions; American Standard product guide; Keith Specialty Trane parts catalog. Verified August 2026.
Related: Control board cross-reference · Ignitor & flame sensor cross-reference · Gas valve cross-reference · Contactor cross-reference · Model number lookup · Furnace short cycling
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