Parts for Bosch HBN5420UC/01: Control Assembly Parts

This control module is the appliance's main electronic control board. It interprets inputs and energizes components to run the correct sequences, restoring reliable operation when the original board is unresponsive, intermittent, or damaged. What it does

• Coordinates timing and operation of motors, valves, heaters, and other loads
• Monitors inputs from switches and sensors to make decisions
• Distributes power and controls relays/outputs to components
• Common failure symptoms: won't start, controls unresponsive or erratic, stops mid-cycle, or shows error codes

• 1 control module

• Disconnect power before servicing; electronic boards can carry residual charge
• Use ESD precautions; handle the board by the edges and avoid touching components
• Document wiring; move connectors one at a time and ensure they are fully seated and keyed correctly
• Secure the board and any ground straps; reassemble, restore power, and run the model's service/diagnostic test if applicable

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 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