How do I find the correct replacement start relay or 3-in-1 start kit for my refrigerator model?
Finding the correct replacement start relay or 3-in-1 hard start kit involves matching part numbers or matching the compressor’s horsepower rating.
Method 1: Finding an Exact OEM Replacement Relay (Recommended)
- Locate the Refrigerator Model Number
- Check the inside wall of the fresh food compartment (left or right side). Frigidaire
- Check behind the lower vegetable crisper drawer. YouTube
- Check the ceiling inside the fridge or the door frame. iFixit
- Note: Do not use the manual’s cover model number, as it is often a generic series number. YouTube
- Look Up the Model Number Online
- Enter the full model number into an appliance parts site (such as PartSelect, RepairClinic, AppliancePartsPros, or eReplacementParts). YouTube
- Search for “Start Relay”, “PTC Starter”, or “Overload Assembly” in the parts breakdown for your unit.
- Check the Part Number Printed Directly on the Old Relay
- Unplug the fridge, remove the old relay, and look for numbers printed on the plastic casing (e.g., QP2-4.7, 2188830, W10613606).
- Typing this code into Amazon, eBay, or an appliance parts store usually yields direct replacement matches.
Method 2: Selecting a Universal 3-in-1 Hard Start Kit (Supco / RCO Series)
If an exact OEM part is discontinued, out of stock, or too expensive, a universal 3-in-1 start kit (which combines a relay, overload protector, and start capacitor into one unit) can be used.
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1. Pick the Right Horsepower Rating (HP)
Check the sticker on the back of your compressor body for the Horsepower (HP) rating or look up the compressor’s part number online. Matches correspond to the standard kit sizes:
| Compressor HP Rating | Compatible 3-in-1 Kit Model (e.g., Supco) |
|---|---|
| 1/12 HP to 1/5 HP (Small/compact fridges & chest freezers) | RCO810 (or equivalent 1/12-1/5 HP kit) |
| 1/4 HP to 1/3 HP (Standard home refrigerators) | RCO410 (or equivalent 1/4-1/3 HP kit) |
| 1/3 HP to 1/2 HP (Large side-by-side or commercial units) | RCO210 (or equivalent 1/3-1/2 HP kit) |
2. Verify Modern Fridge Compatibility
Important: Universal 3-in-1 kits are designed for standard fixed-speed compressors (115V). Do NOT use a 3-in-1 kit on modern Variable Speed Inverter Compressors (typically 3-phase DC compressors controlled by a main PCB). Inverter fridges require an exact manufacturer control module.
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Next Step
If you can share your refrigerator brand and exact model number (or the part number/HP listed on the compressor sticker), the precise replacement part numbers and direct options can be identified for you.