HVAC Motor Not Running Properly? Run Capacitor 36-7.5J370 — Restores 7.5MFD 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 36-7.5J370 is the Rotom OEM replacement that restores proper run capacitance to compatible 7.5MFD, 370V PSC motor circuits.

🇺🇸 Matching U.S. Part Number: 36-7.5J370

❓ 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 7.5MFD run capacitor (not a dual-run capacitor)
• ✔ Original capacitor is rated 370V (not 440V)
• ✔ 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: 36-7.5J370
• Type: Single motor-run capacitor (not a dual-run, not a start capacitor)
• Capacitance: 7.5 µF
• Voltage: 370 VAC
• Shape: Oval
• Width: 2.03 in
• Depth: 1.24 in
• Height: 2.36 in
• Features: Built-in pressure interrupter; UL and cUL recognized
• Brand/OEM: Rotom / AllTemp
• Direct Oval 370V Equivalents: 12007, 12907, POC7.5A, CR7.5X370

⚙️ 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 7.5MFD. A replacement rated at 370V, 440V or 370/440V may be used when its dimensions, terminals and mounting arrangement are compatible. Confirm the oval shape and dimensions (2.03” × 1.24” × 2.36”) fit the mounting strap and cabinet clearance before ordering. Contact us to verify your model number before ordering.

💡 Pro Tip