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Look up into the duct if possible. There should be a damper in the duct called a "backdraft damper" that closes and prevents cold air from entering the duct when the fan shuts off. The damper could also be located near the outlet of the fan which could be a wall or near the roof level (maybe in the attic if it goes through there).
Yep! This is a classic problem with the Therador PHE series hoods. Very weak design and NO help from the factory! Just the plastic housing is $82.00 bucks online. The panel is REALLY hard to access and the control boards, inside, fail regularly. The board alone costs over $200.00 bucks! These will fail to switch on the fan or change fan speeds or turn lights on and off or fan off. All of this randomly and arbitrarily so people tend to push the switch buttons too hard, causing the bracket to fail and entire panel body falling off inside. We have had ours propped up inside with two chop sticks for several years now and to get the fan to switch on or change speeds we fiddle with the chop sticks while repeatedly pushing the buttons and sooner or later it comes on. The lights rarely will come on, however. This unit is made by Bosch and they have all the same problems with NO fix except to replace ENTIRE control panel at a cost of $350.00 retail. This is truely an example of modern, fancy kitchen appliance over-engineered ripoff junk. Looks great but it makes sure that the fool who buys into the Brand name and cool design gets to pay and pay again for their naivete'.
sounds like motor is burned up! I have never seen that brand myself? hoods cab be relitivaly cheap i would leave out the service man and replace the hood...just check pricing then make up your mind! but if you found someone really willing to, what you have can be fixed!!!
We installed our Broan-Allure range hood about ten years ago. On three seperate occasions since, the fan has randomly turned on and none of the control buttons would turn it off. After a while it turns itself off. During those same times, when you turned the lights on, they would blink before finally staying on. On each occasion, I have removed the screens and metal underpieces to gain access to the circut board. Once you can see the circut board, remove and replace the 3 Amp fuse that is mounted on the board. (Radio Shack part # 270-1054)...even if the fuse looks good, replace it. Each time this has work for about three years, then it acts up again..
Sounds like a motor problem...but not necessarily. Cut power to the unit. Expose the motor assembly. Turn the fan by hand...if it is jammed or hard to turn...replace that motor. Not that? There is likely a motor connector. Get a test light at the hardware store. Disconnect the motor and then probe the wires coming to the connector from the power side (with the power on again) to see if the tester glows. Yes...bad motor. No, find the bad connection. It is possible that this unit uses a multi switch...if that's the case, there will be three wires coming out of it...One is power in...the others go to the light and the fan. Then, the switch will be the culprit. Hope this helps.