Bosch Hood Error Code Three speed LEDs blinking

Three speed LEDs blinking simultaneously on a Bosch hood indicates a heat sensor protection fault. The heat sensor, which is responsible for monitoring internal temperatures and activating over-temperature protection, has failed or is not functioning correctly. Because the sensor is integrated into the input board, the input board must be replaced to resolve the fault.

Operating the hood with this fault active is not advisable. The blinking LEDs indicate that the over-temperature protection circuit is non-functional, meaning the hood cannot detect or respond to an overheating condition. Continuing to use the hood without a working heat sensor could allow internal components to overheat without any protective shutdown occurring.

Repair costs will vary depending on your hood model and whether you hire a technician or complete the repair yourself. Input board parts for Bosch hoods typically range from $80 to $250 depending on the model. If you use a professional appliance technician, expect to add labor costs of roughly $75 to $175 on top of the part price, bringing the total repair estimate to approximately $150 to $425.

A knowledgeable DIYer comfortable with appliance repairs can address this fault by replacing the input board. The heat sensor is not a separate replaceable component, so the full input board assembly is the required repair. You will need to locate the correct input board for your specific Bosch hood model and follow proper safety procedures, including disconnecting power before beginning any work.

No, resetting power will not clear this fault. The error is caused by a hardware failure of the heat sensor, which is physically integrated into the input board. Because the defect is component-based rather than a software or communication glitch, the fault will return immediately or persist after any power reset. Board replacement is the only effective solution.