It means that the filters on the hood need to be cleaned. You simply pop them out and can wash them in the dishwasher. Once clean, dry and replaced, you hold down the fan speed button (the second button from the left or " - " minus for more than five seconds.) When you first hit the button the A will appear, hold the button when the letter disappears, the timer has been reset until time for the next cleaning. The microprocessor in the system will flash every 30 hours of operation.
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Unless that's a much bigger range hood than I imagine, there won't be any capacitor - the motor will be of a shaded-pole design. If you have a multimeter, you could measure for voltage on the motor wires when the motor should be running - if reasonable voltage is there but the motor isn't spinning, then the motor's dirty or unlubricated or dead. If no reasonable voltage is present, the electronic controller has failed.
check the fuse. (see post about control board.)
excerpt: ... the control board is in the front of the hood behind the speed & light power buttons. There is a 3/4" Buss fuse onboard that seems to pop on my hood every few months.
An old elecricians joke says "do you know why it hums? It dosn't know the words" Al kidding aside ,have you checked to see how free the fan blade is? The should spin very freely. It kind of sounds to me like it may be having a hard time comming up to full speed. You may try some graphite lube on the motor. If I recall Broan has a lifetime garrentee on the motor. You might just want to repace it if I am correct.
You will need to check inside the button contacts to identify if the control of current is by a series resistor or by the coil winding.
Since the high speed is working it is possible that the series resistor coil is open.So check for loss of contact continuity in the switch, if not you can use the present model of electronic fan controllers to give you a variable fan control. This can be connected to the main hi speed connection.
Tip: Identify the wattage and buy the regulator according to the specs.(42 inch type)
The speed module is very simple: a triac with some extra components to modulate it, it's build exactly the same as the one from a vacuum. That speed module is controlled from the touch screen - are you sure the touch screen is operational? That's relatively easy to test - just put a potentiometer where the control signal goes and see if moving the potentiometer changes the speed.
wow! finally the solution that works! Holding the '+' sign for 4 seconds. We had our vent replaced by kitchenaid once and were about to call again and complain since our new one did just the same thing without resolution using the 'H' button as indicated in the manual! Thanks for help it's so appreciated!
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