Restore reliable heat from your Goodman GMP050-3 with genuine OEM replacement parts from Repair Clinic. The GMP050-3 is a 50,000 BTU upflow gas furnace built on a compact three-ton blower platform, one of Goodman’s smallest residential gas furnaces and a common choice for smaller homes, additions, and conditioned spaces where a higher-output unit would oversize the load. The GMP050-3 uses a two-cell heat exchanger, a three-burner manifold (part B2526000), and a smaller 1/3 HP blower motor (B1340021S rated at 1050 RPM); Goodman, Amana, and Daikin are the same manufacturing family sharing this platform. Parts most frequently replaced include the hot surface igniter, control board B1809913S, flame sensor 0130F00010S, inducer motor B2959000S, and blower motor B1340021S. Browse the full Goodman furnace parts catalog filtered by GMP050-3.
What Makes the GMP050-3 Different from Other Goodman Furnaces: 50,000 BTU Platform-Specific Component Sizing
Because the GMP050-3 sits at the low end of Goodman’s output range, its components are specifically sized for the reduced combustion volume and airflow of a 50,000 BTU installation. The blower motor B1340021S draws notably less current than motors in higher-output siblings, which is why a low circulator current fault code on this model often traces to the capacitor CAP125000370RPS losing its 12.5 microfarad charge rather than a failed motor winding. The inducer motor B2959000S is matched to the two-cell heat exchanger’s draft requirements; substituting an inducer from a larger GMP model would over-draft the heat exchanger and affect pressure switch calibration. For fault code interpretation specific to the B1809913S control board, visit the Goodman furnace troubleshooting section.
Most Replaced Parts on the Goodman GMP050-3
Hot Surface Igniter (B1401018S / 0230K00001)
The GMP050-3 shipped with the silicon carbide igniter B1401018S. Goodman’s current OEM upgrade is the 0230K00001 silicon nitride mini igniter, rated seven times more durable than the original carbide element. On a 50,000 BTU furnace that cycles frequently in a small, well-insulated space, the igniter accumulates thermal cycles quickly. A cracked or open-circuit igniter causes the board to time out at the ignition stage and lock out; never touch the element with bare skin during installation. Browse Goodman furnace igniter parts.
GMP050-3 Control Board B1809913S
The 9-pin HSI control board B1809913S sequences ignition, monitors all safety switches, and stores the LED blink fault code on the GMP050-3. Because this board is shared across several GMP models, a replacement must match the original part number exactly. Document the current blink pattern before ordering; a fault code indicating ignition failure points to the igniter or flame sensor, not the board, in the majority of GMP050-3 service calls. Browse Goodman furnace control board parts.
GMP050-3 Inducer Motor B2959000S
The GMP050-3 uses inducer motor B2959000S, sized for the two-cell heat exchanger’s combustion gas volume — a different motor than the B1859005S used in GMP100 models. A bearing failure presents as a grinding sound during the pre-purge phase. Because the GMP050-3 cycles more frequently per heating season than a larger furnace in the same home, inducer bearing wear can occur sooner than in a higher-output installation. Browse Goodman furnace inducer motor parts.
GMP050-3 Flame Sensor 0130F00010S
The 0130F00010S flame sensor rod confirms combustion is sustained by passing a micro-amp current through the burner flame back to the B1809913S control board. A sensor reading below 1.5 microamps causes repeated lockouts. Testing with a DC microamp meter before replacement separates a genuinely failed sensor from a gas pressure or weak-flame condition that would require a different diagnosis path. Browse Goodman furnace flame sensor parts.
Blower Motor B1340021S and Capacitor CAP125000370RPS
The 1/3 HP B1340021S blower motor run capacitor CAP125000370RPS is rated at 12.5 microfarads — not the 10 microfarads used in some higher-output siblings. A capacitor drifting outside its rated value causes the blower to start slowly or run at reduced speed, triggering the primary limit switch B1370912S. Always test the capacitor before replacing the motor; this is the most common root cause of low circulator current faults on the GMP050-3. Browse Goodman furnace blower motor parts.
Primary Limit Switch B1370912S
The B1370912S primary limit on the GMP050-3 opens at 240 degrees Fahrenheit and has a 7-inch sensor probe suited to the compact heat exchanger in the 50,000 BTU cabinet. A limit that trips consistently is almost always caused by airflow restriction — inspect the filter, clean the blower wheel, and verify all supply registers are open before replacing the switch.
Goodman GMP050-3 Parts at Repair Clinic
- Genuine Goodman OEM Parts Sized for the GMP050-3 Two-Cell 50,000 BTU Platform: Inducer motor B2959000S, blower motor B1340021S, control board B1809913S, igniter upgrade 0230K00001, and flame sensor 0130F00010S confirmed for this specific platform — not generic parts shared across the full GMP range without size verification. Browse the full Goodman furnace parts catalog.
- Platform-Specific Component Sizing Clarity: The GMP050-3 inducer motor (B2959000S) and blower motor (B1340021S) are distinct from motors used in GMP100 models; our listings prevent cross-model substitution errors that affect pressure switch calibration and limit switch performance.
- Goodman Fault Code Guides: Wiring diagrams and the B1809913S blink code sequence are available alongside every GMP050-3 part listing through the Goodman furnace troubleshooting section.
- Same-Day Shipping and 365-Day Returns: Orders placed by 9:00 PM ET ship the same day. All uninstalled parts returnable within one year with no restocking fees.
Goodman GMP050-3 Furnace Parts FAQ
What is the blower motor part number for the Goodman GMP050-3?
The GMP050-3 uses a 1/3 HP direct drive blower motor, Goodman part B1340021S, rated at 1050 RPM with three speeds. This is a smaller motor than those in the 100,000 BTU GMP100 platform. The run capacitor for this motor is CAP125000370RPS, rated at 12.5 microfarads; always test the capacitor before ordering a replacement motor.
What causes a low circulator current fault on a Goodman GMP050-3?
A low circulator current reading typically points to a failing blower motor, a failed run capacitor CAP125000370RPS, a wiring fault in the motor circuit, or a control board relay that is not fully closing. Start by testing the capacitor with a digital meter; if capacitance is more than 10 percent below the 12.5 microfarad rating, replace the capacitor before condemning the motor.
How many burners does the Goodman GMP050-3 have?
The GMP050-3 is built on a two-cell heat exchanger with a three-burner manifold, part B2526000. This compact burner configuration is what distinguishes the 50,000 BTU model from its larger GMP siblings on the same cabinet platform; the GMP100 platform uses a larger four-cell heat exchanger and a different inducer motor.
What primary limit switch temperature is the GMP050-3 rated for?
The primary limit switch B1370912S on the GMP050-3 is rated to open at 240 degrees Fahrenheit with a 7-inch sensor probe suited to the compact heat exchanger. If this limit trips regularly, restrict the investigation to airflow problems — dirty filter, closed registers, or blower motor capacitor failure — before replacing the switch itself.
