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Troubleshooting
Noise during operation.
Problem Possible Explanations
Some noise is normal due to vibration and air movement.
Excessive noise indicates one of the following:
• Ductwork is too small/ undersized.
• Ductwork is too big/ oversized.
• Ductwork is loose.
• Transtition is too small/ too loose.
• Togglebolts are not tightened.
• Loose screws in trim parts, ect.
Noise when not operating.
Backflow flap on outside of duct wall cap moves with the
wind.
Fan motor does not work.
Power supply to hood is not sufficient.
Wires are not completely connected.
Filter light does not turn off (DAH95 models only).
Light must be reset: hold filter button down for 3 seconds
(Always clean filters before resetting filter light).
Filter light does not turn on (DAH95 models only).
Filter light will not come on until after 40 hours of operation.
Lights under hood hum.
A slight hum is normal.
Operation of hood trips breaker.
• Wiring is not correct.
• Circuit is not correct.
Before calling service, check the possible explanations below. If these solutions fail, call Bosch service at 800-944-2904.
Please have your serial number and model number ready. They are located on the underside of the hood on the left side.
Filter light comes on. (DAH95 models only).
Indicates that filters should be cleaned. Hold button down
for 3 seconds to reset.
One light above Speed button blinks (DAH95 models only).
Conditions exceed allowable temperatures. Turn on next
speed level.
All three lights above Speed button blink (DAH95 models only). Heat sensor is not working. Call service.