Fagor 3CFT-90V Fan Intensive speed button- slows the fan down!
I have a Fagor 3CFT-90V Hood. All the functions and buttons on the hood work correctly, except the Intensive Speed Button. When Intensive Speed is activated (with the fan in any speed setting, 1,2 or 3), it actually slows the fan down to a vey slow pace, rather than speed it up to Intensive Speed. The 5 minute timer for the Intensive speed function works correctly and turns off after 5 minutes, so the buttons and swiching logic seems OK. The fan motor also seems to function correctly, except when intensive speed is selected. Any ideas on how to locate this problem and fix it?
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Can you start the fan while holding the motor? If it runs fine while not in the hood, then likely the fan is rubbing against something that is not letting it get up to speed. If the motor does not run when removed from the hood, then there's something wrong electrically - a start capacitor, bad motor, etc. Try to verify the fan is not rubbing on something first.
You have 2 windings in the motor that create a magnetic field. A winding is simply a coil of wire an they do not touch. when applying the voltage (turning on the fan) the windings create the mag. field causing the rotor to turn, which then of course turns the fan blade. When these windings get weak it causes them to heat up due to the resistance in the circuit and you there for loose ur mag. field... Or if the rotor starts getting restricted it will also heat up the windings an cause the fan to stop.. Time for a new venta hood....
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)
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.
The Problem is the wiring. Take the 2 screws retaining the metal plaque off underneath the filters. You will see the wires leaving the motor going into a "molex" plastic connector which connects two another set of wires going to the control board. Check to see if the wiring colors match from side to side of plastic connector. Ive only seen it happen once but it was exactly that. I do service calls for broan & Nutone