W51-34BJA3-02 – BLOWER MOTOR – AIR HANDLER (3/4 HP, 240V, 15MFD)

If your indoor unit runs but produces weak or no airflow, the blower motor may need replacement. This 3/4 HP motor is used in larger air handlers running on 208-230V. Common in Lennox and other brands. If your air handler blower has stopped or struggles to reach full speed, this motor is the fix.

Specs: 3/4 HP, 208-230V, 1075 RPM, 3-speed, reversible rotation, requires 15 MFD capacitor

Replaces: 19L40, W51-34BJA3-02, WG840590

Fits: Lennox air handlers and other 208-230V systems needing a 3/4 HP blower motor. Bring your model number for a match.

Need help? See our AC Not Cooling Troubleshooting Guide.

In stock at Open To Public HVAC Parts in Dallas. We test parts at the counter before you buy. Call or text (214) 340-9421.

Specs

• TypePSC direct-drive blower motor
• Horsepower3/4 HP
• Voltage240V
• Required Run Cap15 MFD

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• 19L40
• W51-34BJA3-02

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.

Fits these models

• Universal aftermarket replacement for direct-drive PSC blower motors with matching HP / voltage / cap requirement
• Common applications: Rheem / Ruud RH / RA series air handlers, Goodman ARUF / AWUF air handlers, Carrier / Bryant air handlers, Trane TAM / 4TEE air handlers (older), York / Coleman air handlers
• Verify HP, voltage, shaft diameter, shaft length, and rotation direction match your existing motor before installing

How do I know if my blower motor is bad?

Pull the blower, spin the shaft by hand — should turn freely with no grinding or wobble. Check resistance between motor leads (varies by HP, typically 1-10 ohms across main winding). Open winding or shorted = bad. But first: test the run cap. A weak cap mimics every blower motor symptom.

Can I go up in HP?

A little — 1/4 HP replacing a 1/6 HP is fine if the application allows the extra airflow. Going DOWN burns out the motor. Always match voltage exactly (120V motor stays in 120V; 240V stays in 240V).

How long should a blower motor last?

8-12 years on average in Dallas. Texas dust + summer cycling shortens that. The cap usually fails first; if you replace the cap on schedule (every 5-7 years), the motor lasts longer.

What's the difference between PSC and ECM?

PSC = permanent split capacitor, the classic single-speed-with-tap motor. ECM = electronically commutated, variable-speed and 30%+ more efficient. You can replace PSC with PSC, but you generally CAN'T replace PSC with ECM without a new control board too. Different worlds.