Parts for R420DW — Sharp Microwave

We found 22 parts confirmed to fit the Sharp Microwave R420DW.

Compatibility table

Prices shown are an informational reference range only, not an offer or an Amazon price — RepairKitHub does not sell parts directly. Each part links to an Amazon search so you can compare current listings yourself.

Common failure areas on this model

The confirmed parts above group into a handful of failure areas. Here is what each points to and how to check it before you order anything.

General hardware and mounting parts

Symptom: A small mechanical or mounting part has failed, cracked, or gone missing.

Check: Compare the physical shape and mounting points to the original piece, and confirm the exact part number against your model plate before ordering.

Parts in this group on R-420DW: 709299 (FUEL LINE), VHICM1234O81Y (IC CM1234-08), STD374110 (Terminal), 577320 (Toro Spindle Bearing), KM270107005 (Solenoid), PSHEPB021MRE0 (Sealer Fil), PCOVPB085MRP0 (WAVE GUIDE C), QFSTA013WRE0 (Temperature Fuse), FHDZB008MRY0 (Diode), VHD11ES11 (Diode), PHOKB018MRF0 (Hook), LSTPPB021MRF0 (Latch), FFSBA016KIT (MONITOR SWIT).

Storage, trim and cosmetic hardware

Symptom: A cracked shelf, broken door bin, worn hinge, or missing trim piece -- cosmetic and storage wear rather than a functional breakdown.

Check: Match the physical dimensions and mounting tabs of the old part before ordering; these pieces are often model-specific even between visually similar models.

Parts in this group on R-420DW: WB56X31636 (STAINLESS STEEL GLASS & PANEL DOOR), 3436933 (Clip), W11104746 (Refrigerator Machine Compartment Grille (Stainless)), P0731B (Gas Grill Burner Box Panel, Front), 137317412 (Washer Control Panel), QCNCMA446DRE0 (CONNECTOR).

Controls, timers and wiring

Symptom: A cycle that doesn't advance, an unresponsive display, or the unit not starting at all.

Check: Look for burn marks or a burnt smell near the board or terminals, and check whether buttons and knobs respond -- a unit that powers on but won't cycle often traces back to this group.

Parts in this group on R-420DW: 463567053 (Power Control Board Assembly).

Door, lid switches and latches

Symptom: The appliance won't start, or stops, unless the lid or door is fully latched shut.

Check: Listen for an audible click when the lid or door closes. No click, or a visibly cracked plastic tab on the latch, points to this part.

Parts in this group on R-420DW: 5304479791 (Wine Cooler Door Switch Bracket).

Water inlet and drainage

Symptom: The unit isn't getting water when it should, or isn't draining or pumping it out when it should.

Check: Check the valve or pump for a clog or jammed object, and confirm the hose isn't kinked, restricted, or routed higher than the unit allows.

Parts in this group on R-420DW: 1901A (Drain Pump).

Before you buy

Match R420DW exactly against the model and serial plate on the appliance itself before ordering anything — a single mismatched character can point to a different production run with different parts. Then check the part number printed or stamped on the part you are replacing against the part numbers in the table above; the printed number is the most reliable way to confirm fitment when a model has gone through multiple production runs. RepairKitHub does not sell parts directly — every part link above routes to an Amazon search for that part number so you can compare current listings and sellers yourself.

How to confirm this is your model

On most microwaves, the model and serial plate sits inside the door frame. Match every character exactly, including letters and dashes at the end — appliance model numbers often have similar prefixes but different suffixes for different production runs.

Neighbouring Sharp Microwave models

These model numbers sort next to this one in the catalog and are usually the same product family.

• R-420EK — 12 parts
• R-425EW — 24 parts
• R-426HK — 23 parts
• R-426HS — 13 parts
• R-426HW — 26 parts
• R-420DK — 21 parts
• R-420CW — 27 parts
• R-420CK — 19 parts
• R-419CK — 10 parts
• R-415EW — 21 parts

Still not sure?

Use the model lookup tool to search by model or part number, or start from the symptom your appliance is showing.