RELAY - START

This component—relay start, part F620057-59—is ordered when symptoms point to a failure in this area. Keeping the removed part for comparison until testing is complete can help avoid installation surprises. As a relay/contactor, this part is used to restore switching in the start/run circuit for a load. When this part fails, technicians may see short cycling, compressor not engaging, and clicking but not starting. Technicians often replace this component after confirming clicking but not starting, short cycling, or inconsistent engagement. Before replacement, technicians typically verify inputs/outputs (or fitment/movement for mechanical parts) so the root cause is confirmed. Relays/contactors are usually checked for coil continuity, contact wear, and terminal heat marks that can cause voltage drop or chatter. Replacing the correct component helps restore predictable operation and reduces repeat service calls when the diagnosis is accurate. If the part is in a water path, do a leak check during the first run and again after the unit has operated for a short period. Recheck fasteners and connectors after the first cycle to confirm everything remains tight under vibration and normal operation. 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.