Capacitor Start

The capacitor start (part F620167-54) is typically replaced when wear or damage affects normal operation. In commercial equipment, small differences in revisions can change fitment, so it’s worth verifying the exact part number and placement. As a capacitor, this part is used to restore starting and running performance for motors/compressors. Common complaints tied to this category include weak startup, humming and not starting, and startup trip. In repairs, replacement is considered when inspection and testing confirm the fault is tied to this component. Recheck fasteners and connectors after the first cycle to confirm everything remains tight under vibration and normal operation. Disconnect power before service, document the original layout with a photo, and reinstall so nothing pinches, rubs, or binds. Once the failed part is confirmed and replaced, cycle behavior should normalize and performance should return to expected operation. If the issue is intermittent, look for heat marks, vibration wear, loose connections, or binding movement that changes under load. Capacitor service often includes checking capacitance value, inspecting terminals for heat damage, and confirming the connected motor/compressor is not locked. Replacing the correct component helps restore predictable operation and reduces repeat service calls when the diagnosis is accurate. If multiple symptoms overlap, complete the diagnosis before ordering so the replacement targets the true root cause. Inspect surrounding wiring, tubing, and mounting points so the new part is not exposed to the same stress that damaged the old one. After a successful repair, technicians often note the symptom and test result to make future troubleshooting easier. Cleaning the area around the repair helps improve fitment and makes leak or vibration checks more reliable. If multiple symptoms overlap, complete the diagnosis before ordering so the replacement targets the true root cause.