Bosch E15 Parts Guide — Float Switch, Inlet Valve, Drain Hose

Field note (2026-08-10): Buy parts after a 15-minute diagnosis. The float switch is the frequent electrical culprit; the inlet valve is the frequent slow leak; the hose is the frequent install fault.

How to choose the first part

Model matching rule

Bosch part numbers shift by platform. Use the E-Nr / FD on the door sticker in the Bosch parts catalog or a reputable parts site’s model lookup. The numbers above are common service stand-ins, not a guarantee for every SKU.

Price bands (parts only)

• Float: ~$20–$50
• Inlet valve: ~$40–$90
• Drain hose: ~$20–$45

Link back to the full procedure

For the full leak-finding sequence, use Bosch E15 — water in base. This page is the parts shortlist once you know what failed.

Do not buy the “E15 kit”

Marketplaces sell five-piece E15 bundles (float + valve + hose + random gasket + “sensor”). You will use one of those parts. The rest sit in a drawer. Diagnose 15 minutes, then order one matched SKU.

Order of operations we use on the bench:

1. Dry pan. If E15 is gone and the pan stays dry through a full cycle, you needed towels, not parts.
2. Float mechanical + continuity. Replace float only if it is stuck or electrically always-closed/always-open.
3. Watch for idle drip. That is the valve.
4. Inspect hose and high loop last if water appears during drain.

How to confirm a part number without guessing

On the door edge: E-Nr (model) and FD (date). Look up that E-Nr on Bosch’s parts diagram or a parts site that requires the model—not a search for “E15 float.” If 00631199 is not on that diagram, do not force it.

Same rule for 00622058 and 00298564. They are common service stand-ins on 800-series-class machines, not a universal Bosch key.

If two seams are wet (sump and door corner), stop shotgunning parts and find the fill/overflow path. Multiple wet seams usually means the machine overflowed once, not that every gasket failed the same day.