Dishwasher Not Heating Water? Water Heater Assembly 00480317 – Fix Bosch Heating Failure Fast

Dishes coming out cold, greasy, or with detergent residue after a full cycle is a direct sign of water heater failure. In most Bosch dishwashers, this is caused by a failed water heater assembly. When it fails, the wash water never reaches sanitizing temperature — detergent won't activate properly, grease won't cut, and the drying cycle loses its thermal assist. ⚡ Common failure point in Bosch-built dishwashers after 5–8 years of use. Part 00480317 is the genuine OEM replacement that restores full water heating and drying performance in a single repair.

❓ Is This the Right Part?

This is the correct fix if ALL of the following are true:

• ✔ Dishwasher powers on and runs a full cycle normally
• ✔ Water fills correctly — no fill or drain errors
• ✔ Wash arms spin and spray water during the cycle
• ✔ Detergent dispenser opens and releases during wash
• ✔ ONLY problem is water not heating — dishes cold, wet, or greasy after cycle

Not sure? Send us your model number — we'll confirm before you order.

🔧 Common Symptoms

• Dishes come out cold to the touch after a full hot wash cycle
• Greasy film or detergent residue left on dishes — detergent not fully dissolving
• Dishes still wet after cycle — no heat-assist drying
• Dishwasher runs but water never gets hot (confirmed by hand-checking mid-cycle)
• Error code E09 displayed on Bosch panel (heating element fault)
• Cycle takes longer than normal — control board waiting for temperature target that never arrives

✔ If these symptoms match, this is the most likely failed component in the system.

✔ In most cases, replacing this water heater assembly restores normal operation immediately.

📦 Part Details

• Part Number: 00480317
• Type: Dishwasher water heater assembly — integrated heating element and flow-through housing
• Replaces: OEM direct-fit water heater assembly — supersedes 00480316, 480316, 480317 (no modification required)
• Brands: Bosch, Siemens, Gaggenau, Neff

⚙️ Installation

Skill Level: Moderate — 45 to 75 minutes. Disconnect power and shut off the water supply before starting. Pull the dishwasher out from the cabinet to access the underside. Disconnect the wiring harness and water inlet/outlet connections from the heater assembly, remove the mounting hardware, and swap in the new unit. Reconnect all wiring and plumbing, slide the unit back, restore power and water, and run a heated wash cycle to confirm normal temperature operation. Torque all hose clamps snugly — do not overtighten plastic fittings.

💡 Pro Tip

Full model compatibility list in product tags. Don't see your model? Contact us with your full model number and we'll verify fit before you order.

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