HVAC Motor Not Running Properly? Run Capacitor 36-3-370440 — Restores 3MFD Motor Run Capacitance
If your HVAC motor hums but won’t start, runs weakly, or draws excessive current, a failed run capacitor is one of the most common causes. In PSC (permanent split capacitor) motors, the run capacitor provides continuous phase-shift support while the motor is operating. When it fails, the motor loses efficiency, struggles to start, or stops running entirely. ⚡ Common failure point in condenser fan motors, blower motors, and auxiliary motor circuits. Part 36-3-370440 is the Rotom OEM replacement that restores proper run capacitance to compatible 3MFD PSC motor circuits.
🇺🇸 Matching U.S. Part Number: 36-3-370440
❓ Is This the Right Part?
This is the correct fix if ALL of the following are true:
- ✔ Motor circuit is confirmed to require a single 3MFD run capacitor (not a dual-run capacitor)
- ✔ Electrical supply to the unit is confirmed OK
- ✔ Motor windings are not open or shorted
- ✔ ONLY problem is the motor failing to start or running below rated speed
Not sure? Send us your model number — we’ll confirm before you order.
🔧 Common Symptoms
- Motor hums but won’t start or start is sluggish
- Fan or blower runs at reduced speed
- Motor overheats or trips thermal overload
- Unit draws higher than normal current
- Capacitor is visibly bulged, leaking, or measures out of spec
✔ If these symptoms match, this is the most likely failed component in the motor circuit.
✔ In most cases, replacing the run capacitor restores normal motor operation immediately.
📦 Part Details
- Part Number: 36-3-370440
- Type: Single motor-run capacitor (not a dual-run, not a start capacitor)
- Capacitance: 3 µF
- Voltage: 370/440 VAC
- Shape: Oval
- Width: 2.03 in
- Depth: 1.24 in
- Height: 1.58 in
- Features: Heavy-duty compact construction; built-in pressure interrupter; UL and cUL recognized
- Brand/OEM: Rotom / AllTemp
- Direct Oval Equivalents: PPS3440OV, POCF3, POCF3A, TOCF3, 45030H, TP3440, CR3X440, 12027, 12927, 27L1022BX
Inspect the motor windings and contactor at the same time. A capacitor that has failed due to age or heat stress often indicates the motor itself is approaching end of life. Confirming motor condition during the same service call prevents a repeat failure.
⚙️ Installation
Skill Level: Moderate — 20 to 45 minutes. Disconnect and lock out power to the unit before opening the electrical compartment. Capacitors retain a hazardous charge after power is removed — discharge safely before handling. Match the terminal connections exactly to the original wiring. Confirm oval mounting strap fit, available height and cabinet clearance before installing — dimensions vary between equivalent brands. Diagnosis and replacement should be completed by a qualified HVAC technician.
✓ Compatible Models
Compatibility for this capacitor is specification-based. Capacitance must remain exactly 3MFD, and the replacement voltage must equal or exceed the original equipment requirement. Confirm the oval shape and dimensions (2.03” × 1.24” × 1.58”) fit the mounting strap and cabinet clearance before ordering. Contact us to verify your model number before ordering.
💡 Pro Tip
The 36-3-370440 is an oval capacitor. Round equivalents like PRCF3 and square equivalents like 36-3S440 carry the same 3MFD rating but require different mounting straps. If your original bracket is oval, order an oval replacement. Photograph the original capacitor and bracket before removing it to confirm the correct case style.
✅Compatibility & Cross Reference
Not sure about your model number? Call 1-877-899-7278 and we’ll help you confirm. All brand names are the property of their respective owners and are used for compatibility reference only.
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