Parts for Bosch HBN3550UC/09: Pcb Assembly Parts

This replacement part is an oven control board. The oven control controls the main functions of the oven, such as turning the oven on, maintaining and adjusting temperature, as well controlling the digital display. If the oven isn't turning on or heating properly, it might be time for a new control board. Replacing the control board is a simple job. First, make sure the range is unplugged. Then access the back of the oven and remove the upper back panel. Locate the old control board and take note of the orientation of the wire connections. Remove the wire harness and any individual wires attached to the old board. Then secure the wires into the new board in the correct order. Snap the new board back in place, and reinstall the upper back panel.This OEM part is compatible with Bosch, Gaggenau, and Thermador ovens and is sold individually.

This Terminal Box is an OEM part for Bosch Built-In Ovens. Integral to the oven's electrical system, this component serves as a secure connection point for various electrical wires within the appliance.

A common issue with a malfunctioning Terminal Box is loose connections or damage to the terminal block due to heat exposure or aging. 

Symptoms of a defective Terminal Box may include:

• Inconsistent power supply to the oven
• Non-functional heating elements
• Sparks or electrical arcing within the terminal box area

This OEM Bosch part is also compatible with Thermador, Gaggenau, and some Kenmore models.

The Relay is an OEM component specifically designed for select Bosch built-in ovens. As a basic electronic switch, it receives signals from the control unit to energize heating elements. 

Durable plastic encapsulation protects delicate components from accidental spills. Precise switching facilitates customized baking and broiling temperatures within close tolerances.

Causes signaling relay failure related to prolonged thermal stresses from consistent oven use. Impacts of electric abnormalities could also cause malfunctions over time.

Symptoms requiring replacement include:  

• Inability to power top or bottom heating elements during cycles
• Erratic temperature fluctuations beyond adjustment capabilities
• Buzzing or loud clicking noises emitting from the relay housing

This OEM Bosch replacement part is also compatible with Thermador, Gaggenau, and select Kenmore built-in ovens employing identical temperature modulation methods. Reinstallation ensures continued customizable and safe cycle performance.
 

This fan blower wheel circulates air inside the appliance to help maintain even temperatures and proper cooling. Replacing a worn or broken fan restores airflow and helps the appliance reach set temperatures consistently. What it does:

• Moves air through the evaporator/condenser area to support cooling and defrost cycles
• Helps prevent hot or cold spots by circulating conditioned air
• Commonly related to reduced cooling, noisy operation, or no airflow from the vents
• Can be a root cause of frost buildup or temperature fluctuations when failed

• Disconnect power before starting any repair to avoid electrical shock
• Access may require removing interior panels or the evaporator/condenser cover
• Inspect the mounting and motor for wear; replace the fan only if it matches the OEM shape and fit

This door latch secures the appliance door and helps enable normal operation by keeping the door closed and latched during cycles. Replacing a worn or broken latch restores proper door engagement and reliable start/lock behavior. What it does:

• Secures the door closed so the appliance can run and complete cycles
• Engages with the strike to maintain a tight, consistent seal during operation
• Helps the control detect a closed/locked door and permit cycle start
• Commonly replaced when the door won't stay closed, won't lock, or the unit won't start

• One replacement door latch

• Disconnect power and water before beginning any repair
• Access may require removing the inner door panel or front trim—keep fasteners organized
• Verify alignment of the latch and strike before reassembly to ensure proper engagement
• If the latch has electrical connectors, reconnect securely and avoid pinching wires

This factory fixing kit provides the mounting hardware needed to secure the applicable component or panel on your appliance. Replacing worn or missing fasteners restores proper alignment and a solid, rattle-free installation.

• Secures panels, brackets, or trim to the appliance chassis or door
• Helps prevent shifting, vibration, and rattling during operation
• Restores correct alignment and fit when hardware is missing or stripped
• Useful during initial installation or when re-installing serviced parts

• Disconnect electrical power; if your appliance is plumbed, shut off water before servicing
• Follow your model's installation/service instructions for exact hardware locations and orientation
• Tighten hardware evenly; do not overtighten to avoid damaging plastic or sheet metal
• Verify alignment and smooth operation before restoring power and/or water

This mounting bracket secures appliance panels or components in place to restore proper fit and stable operation. A simple replacement when a broken or bent bracket causes rattling, misalignment, or loose panels. What it does

• Provides structural support to hold panels, trim, or assemblies in position
• Prevents rattling and vibration from a loose or damaged bracket
• Restores proper alignment of the attached component for normal operation
• Can fail from bending, cracking, or fastener loss, leading to gaps or movement

• One mounting bracket

• Disconnect power and shut off water before starting any repair
• Use appropriate tools to remove fasteners; keep track of mounting screws or clips
• Inspect surrounding parts and fasteners for damage; replace any stripped hardware
• Handle sharp edges carefully and test fit before reassembly

This cable harness connects key electrical components to restore power and signal flow in the appliance. It replaces a damaged or faulty wiring harness to help return controls and components to normal operation. What it does:

• Carries power and control signals between the control board and components
• Replaces frayed, burned, or broken wires that cause intermittent or no operation
• Common symptoms it can address: appliance won't start, controls unresponsive, intermittent cycles, or error codes related to open/shorted circuits
• Helps ensure secure connector mating and correct signal routing when installed properly

• Disconnect power at the breaker or unplug the appliance before starting any repairs
• Compare the new harness to the old one and follow the appliance wiring diagram for correct routing and connector placement
• Secure connectors fully; avoid sharp bends or pinching the wires during reassembly

This cable harness delivers the electrical connections between control circuits and components so your appliance can receive power and communicate signals reliably. Replacing a worn or damaged harness restores proper electrical connectivity and control response. What it does:

• Routes power and signal wiring between the control board and components.
• Restores lost power or intermittent operation caused by broken, chafed, or corroded wires.
• Stops control errors and communication faults that show as failed cycles, unresponsive buttons, or error codes.
• Keeps wiring organized and secured to prevent shorting or pinched cables.

• Disconnect power to the appliance before beginning any work to avoid shock.
• Note wire routing and connector locations before removal; replace connectors in the same positions.
• Handle terminals gently to avoid bending pins; ensure connectors are fully seated.
• If routing through clips or tie-downs, secure the harness to prevent contact with moving or hot parts.