When your Dometic rooftop AC unit struggles to start, runs sluggishly, or won't cool at all, a failed run/start capacitor is a common culprit. This M.C. Enterprises replacement dual-run capacitor (part 3313107.018MC, SKU 06-7874) is built to exact OEM specifications for the Dometic B57915 series -- so you get a straightforward, direct-fit repair without guesswork.
Capacitors are among the most common failure points in RV rooftop air conditioners. Over time, heat cycling, vibration, and age degrade capacitance values, causing the fan motor or compressor to struggle at startup or fail entirely. Replacing a worn capacitor is one of the most cost-effective AC repairs you can make -- and this M.C. Enterprises unit is engineered specifically for the Dometic B57915 application.
This is a dual-run capacitor rated at 50/5 MFD and 370 volts, matching the original specification for the fan motor and compressor circuits in the B57915 series. At 1-15/16 inches in diameter and 4-1/2 inches in overall length, it drops directly into the original mounting location with no modification required.
50/5 MFD dual-run design supports both the fan motor and compressor circuits in a single compact capacitor.
Rated at 370 volts AC to match the original Dometic B57915 specification and handle typical RV power conditions.
Engineered to replace Dometic part 3313107.018 in models B57915.711C0 and B57915.711J0 without modification.
Backed by M.C. Enterprises' limited 2-year manufacturer warranty for peace of mind on the road or at the campsite.
Not sure if the capacitor is your problem? Common signs of capacitor failure in a Dometic B57915 unit include:
Replacing the fan capacitor on a Dometic B57915 is a common DIY repair for RV owners comfortable working with 120V AC systems. General steps include: