If the answer is yes, it failed, and youвЂ™ll need to replace it. Move on from there to see if the ECB has burn marks. You want to make sure that nothing is broken or disconnected. Start by unplugging the range hood and check that the wiring connections between the control and the fan motor. Much like our previous entry on the list, if the lights arenвЂ™t working, this is a lot of guess and test. If all of that is good, then itвЂ™s the ECB thatвЂ™s failing and needs to be replaced because the board is no longer registering the senorвЂ™s input properly. If the sensor is in working order, check both the wiring and the connections. If the reading that youвЂ™re getting doesnвЂ™t meet the expected resistance on the sheet, the sensor needs to be replaced. YouвЂ™ll be looking for a temperature/resistance chart. YouвЂ™ll want to find the tech sheet or the technical data for your model and use a multimeter to check its resistance. If you were to open up your range hood, youвЂ™d find a temperature sensor for measuring the air over your cooktop. If, however, your fan is turning on even when the cooktop is off, a failed sensor, a broken ECB, or loose wiring could be the cause. If the temperature has gotten warm enough to alert the sentry system, it will turn on the exhaust fan. Some models have a вЂsentry featureвЂ™ that monitors the air above the cooktop. Symptom: The Fan Turns On By Itself Cause: Check the grease filters, the air damper, and see if the blade or fan motor are damaged.

From there, itвЂ™s the same as an external venting model. If, on the other hand, your range hood circulates the air back into the kitchen via a charcoal filter, things are only slightly different. If so, the only option there is to fix it. If youвЂ™re still not getting a proper speed or your fan is making noise, it might be the fan motor. Once youвЂ™ve closed everything up, turn on the fan. A damaged blade is no longer aerodynamic, so itвЂ™s not going to pull air in properly. While you have the range open, take a look at your fan blade to see if itвЂ™s damaged. Also, check out the damper thatвЂ™s above the fan to make sure that one opens properly as well. If it doesnвЂ™t open, itвЂ™s time to replace it. The air damper keeps air from flowing in through the vent when the range hood isnвЂ™t running. From there, take a look at the air damper. If your range hood exhaust outside your home, start by checking the grease filters. The problem might be that your fan isnвЂ™t pulling in much air. YouвЂ™re trying to clear out your kitchen because your kid smoked it up, trying to make lunch. Symptom: Your Fan IsnвЂ™t Pulling Much Air Causes: Then check that the light sockets are receiving electric current, again using the multimeter. If youвЂ™ve replaced your switch and itвЂ™s still not working, replace the bulbs. Then youвЂ™ll need to use a multimeter to test between the switch and the lights to see if there is continuity. Start by turning off and unplug the range hood. If, however you get to avoid this nonsense, because your range hood uses a switch, you get to do something different. If the lights still donвЂ™t work, then youвЂ™ll need to replace the user interface control. If the ECB isnвЂ™t turning the lights on, youвЂ™ll need to replace it. This is where our warning from up top comes in. From there, it sends a signal up to the ECB via a ribbon cable. The user interface control is the keyboard and display panel that you select different functions on. If your range hood controls the lights via a user interface, you may need to replace it if it isnвЂ™t sending signals to the ECB when youвЂ™re pushing buttons. If there are burn marks, youвЂ™ll need to replace the ECB, because that indicates a failure.

If the wiring is good, take a look at your Electronic Control Board (ECB) for burn marks. If any of the wiring is loose or broken, repair or reconnect that while you have it open. Start by unplugging the hood and checking out the wiring connections between the light sockets and the control board or the light switch. Sort of вЂњwell, if this didnвЂ™t work, then I need to replace this and see if that fixes it.вЂќ Warning: Because of the way range hoods are set up, much of the work is guess and test when youвЂ™re doing it yourself.

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