Troubleshooting
Before calling service, check the possible explanations below. If these solutions fail, call Bosch service at
Problem | Possible Explanations |
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Noise during operation. | Some noise is normal due to vibration and air movement. |
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| Excessive noise indicates one of the following: |
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| • Ductwork is too small/ undersized. |
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| • Ductwork is too big/ oversized. |
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| • Ductwork is loose. |
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| • Transtition is too small/ too loose. |
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| • Togglebolts are not tightened. |
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| • Loose screws in trim parts, ect. |
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Noise when not operating. | Backflow flap on outside of duct wall cap moves with the |
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| wind. |
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Fan motor does not work. | Power supply to hood is not sufficient. |
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| Wires are not completely connected. |
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Filter light does not turn off (DAH95 models only). | Light must be reset: hold filter button down for 3 seconds |
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| (Always clean filters before resetting filter light). |
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Filter light does not turn on (DAH95 models only). | Filter light will not come on until after 40 hours of operation. |
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Filter light comes on. (DAH95 models only). | Indicates that filters should be cleaned. Hold button down |
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| for 3 seconds to reset. |
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Lights under hood hum. | A slight hum is normal. |
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Operation of hood trips breaker. | • Wiring is not correct. |
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| • Circuit is not correct. |
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One light above Speed button blinks (DAH95 models only). | Conditions exceed allowable temperatures. Turn on next |
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| speed level. |
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All three lights above Speed button blink (DAH95 models only). | Heat sensor is not working. Call service. |
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