Rotom HVAC Dual Run Capacitor 36-405R3744, Round 40/5MFD 370/440V

Is This the Right Part?

✅ Cross Reference Information

Common Symptoms

• Compressor hums but fails to start or trips on thermal overload
• Condenser fan motor struggles to start or runs at reduced speed
• HVAC system short-cycles or shuts off shortly after starting
• Capacitor body is visibly bulged, leaking, or reads out-of-tolerance on a capacitance meter
• One or both circuits (compressor or fan) fail while the other continues to operate

Check Before Replacing

• Test both capacitance values (40MFD and 5MFD) separately with a dedicated capacitor tester — confirm a defective reading before ordering
• Inspect the contactor for pitting or burning — a worn contactor is a common co-failure with a capacitor in aging condensing units
• Check wiring and terminal connections — loose or corroded terminals cause identical symptoms without capacitor failure
• Verify the original capacitor label matches 40/5MFD and 370V or 440V before ordering — MFD values must match exactly
• Confirm the round body (2.36in diameter × 4.72in height) fits the existing mounting bracket and cabinet clearance

Part Details

Verified Compatible Models

370/440 VAC, No verified exact equipment models confirmed. Specification-based HVAC replacement: 40/5MFD, round case. Verify both capacitance values, voltage, terminal arrangement (C/FAN/HERM), and dimensions before ordering.

Fitment reminder: Match the complete appliance model number, including suffix or revision where applicable, before ordering.