No panic when your Thermador hood makes some noise, it’s normal. Actually, the owners must be alert in case of strange and unfamiliar sounds. Over time, cooker hoods can sometimes start to make a lot of noise. Don’t ignore the issue and fix it ASAP. Over time, cooker hoods can sometimes start to make a lot of noise. Before causing further damage it is advised that you have your fan and extraction system professionally audited, this is the best way to establish whether the cleanliness of the duct-work is the cause and if it is at a safe, hygienic level. When it isn’t a cleaning issue, start parts diagnostic. Most cooker hoods are fitted with a non-return valve that prevents the expelled air from re-entering. From time to time, this valve may produce a clapping sound. This can be caused by grease or general wear and tear, or can be due to the valve not being installed properly. You can check this component yourself. It will be located at the point where the air exits the hood. If the valve is moving too freely and producing a noise, one thing you can do is apply a piece of blu tack (or similar) to dampen its flapping movement. Active carbon filters, as used on recirculating type hoods, should as a general rule be replaced once every three months. If these filters get too worn, they can crack and may allow small pieces of carbon to pass through. These pieces of carbon will then end up generating noise, similar to the way small pebbles do when shaken in a box. If the filters are damaged, we recommend you replace them. The impeller bolts onto the motor spindle and will normally be made from plastic. Impellers can sometimes end up rubbing against a foreign object, or they can simply break. If either of these things occur, it will generate a lot of noise. Check the general condition of the impeller, and also make sure the bolt that holds it in place is properly tightened. Surely, delegating the issue to professionals will reduce the probability of error and future malfunction.
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