Parts for 51GMA121321B — Carrier Air Conditioner

We found 49 parts confirmed to fit the Carrier Air Conditioner 51GMA121321B.

Compatibility table

Prices shown are an informational reference range only, not an offer or an Amazon price — RepairKitHub does not sell parts directly. Each part links to an Amazon search so you can compare current listings yourself.

Common failure areas on this model

The confirmed parts above group into a handful of failure areas. Here is what each points to and how to check it before you order anything.

General hardware and mounting parts

Symptom: A small mechanical or mounting part has failed, cracked, or gone missing.

Check: Compare the physical shape and mounting points to the original piece, and confirm the exact part number against your model plate before ordering.

Parts in this group on 51GMA121321B: 1735568SM (Arm Hub), 1476230210 (Carburetor), KIT01472 (Kit), 532147521 (Kit.hsg.20sd), X52487051 (Outer Hook), EP88SWITCH (Power Switch), 6699425 (VOLUTE CASE), 51GM400121 (Evaporator Coil), EAD61073414 (LG Single Harness), 51CM400974 (Cord), 51GM400501 (CONDENSER COIL (51GMA228301B, 51GMA228311B)), HX29ZZ032 (BUSHING, TERMINAL (51CMC012311B) (51CMC112101B) (51CMD012301B)), 51GM500104 (EVAPORATOR SCROLL), 51CM500292 (EXHAUST SCREEN), 51GM500144 (Filter), 51GM500013 (GUSSET, TOP), KA89JC101 (HOLDER, OVERLOAD), 51CM400431 (Package Hardware), 51CM500122 (Part), 51GM400371 (WINDOW MOUNT ASSEMBLY (LH)), 51CM500082 (Bar Gang), 42819012 (Blower Fan Wheel), 8210345 (Energy Guide), HK25ZZ001 (Motor), 51CM500282 (Seal Door), 51CM500143 (Linkage).

Storage, trim and cosmetic hardware

Symptom: A cracked shelf, broken door bin, worn hinge, or missing trim piece -- cosmetic and storage wear rather than a functional breakdown.

Check: Match the physical dimensions and mounting tabs of the old part before ordering; these pieces are often model-specific even between visually similar models.

Parts in this group on 51GMA121321B: 156338411 (Connector 50), 36378307000 (End Panel), DJ6400412A (GRILLE-CYC), DA6307349B (Hinge Cover), 207639 (Home Electronics Screw), 1090990065 (Home Electronics Spring), 9JZGP28HSL103 (SHIELD,WIN), AH9601907A (Cap Cover), 51CM500622 (Seal Grille), 316224772 (Central Air Conditioner Evaporator Coil and Drip Pan), 51GM400211 (BASEPAN ASSEMBLY (51GMA114101B, 51GMA121301B)), 51GM400611 (BASEPAN ASSEMBLY (51GMA118301B, 51GMA118311B)), 99LR400001 (Hi/lo Knob), HX50ZZ011 (Cover), 51CM500632 (Spring), 51FA500062 (Door Spring), 4820 (Feed Cam).

Drive system (belts, pulleys, motors)

Symptom: A drum or tub that won't turn, a burning-rubber smell, or a loud thump or squeal during a cycle.

Check: With power off, turn the drum or tub by hand -- resistance or grinding points to the motor or a bearing, and a cracked, glazed, or snapped belt is visible once the cabinet is open.

Parts in this group on 51GMA121321B: 8133 (Toro V-Belt).

Heat control (thermostats, fuses, heating element)

Symptom: The appliance runs but heats or cools inconsistently, or shuts off partway through a cycle.

Check: With the appliance unplugged, check continuity across the part with a multimeter -- no continuity means it has failed.

Parts in this group on 51GMA121321B: 51CM501132 (BRACKET ,INDOOR THERMOSTAT), P4214025 (START THERMISTOR (NOT SHOWN) (51GMA009101B, 51GMA114101B, 51GMA114111B, 51GMA118301B, 51GMA121301B)), 51CM660001 (Thermostat).

Interior lighting

Symptom: The interior light doesn't turn on when the door opens.

Check: Confirm power is reaching the socket, then check the door-activated light switch before assuming the bulb itself is at fault.

Parts in this group on 51GMA121321B: HY19AD017 (Pilot Light).

Door and drum seals

Symptom: A door or drum seal that has lost its grip, letting water or conditioned air escape past it.

Check: Inspect the seal for tears, flattening, or gaps, and check it against your model's part number before ordering.

Parts in this group on 51GMA121321B: KA56XM043 (GASKET TERMINAL COVER (51FTZ118360) (51FTZ218360) NOT SHOWN).

Before you buy

Match 51GMA121321B exactly against the model and serial plate on the appliance itself before ordering anything — a single mismatched character can point to a different production run with different parts. Then check the part number printed or stamped on the part you are replacing against the part numbers in the table above; the printed number is the most reliable way to confirm fitment when a model has gone through multiple production runs. RepairKitHub does not sell parts directly — every part link above routes to an Amazon search for that part number so you can compare current listings and sellers yourself.

How to confirm this is your model

Check inside a door opening, on a back or side panel, or behind a removable panel or drawer for a label printed with the model and serial number. Match every character exactly, including letters and dashes at the end — appliance model numbers often have similar prefixes but different suffixes for different production runs.

Neighbouring Carrier Air Conditioner models

These model numbers sort next to this one in the catalog and are usually the same product family.

• 51GMA228311B — 42 parts
• 51GMB009101B — 19 parts
• 51GMB009111B — 18 parts
• 51GMB114101B — 9 parts
• 51GMB118301B — 9 parts
• 51GMA121301B — 31 parts
• 51GMA118311B — 11 parts
• 51GMA118301B — 32 parts
• 51GMA114111B — 28 parts
• 51GMA114101B — 32 parts

Still not sure?

Use the model lookup tool to search by model or part number, or start from the symptom your appliance is showing.