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F2 error code on a Frigidaire Dehumidifier FDL50S1. Indicates a sensor failure but what sensor and how do I fix it?

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Okay. I just fixed the F2 problem on the 50S1 and this might take a bit to explain. I suspect this is a generic problem with Frigidaire dehumidifiers but this fix is specific to the 50S1 since each housing is different. Consult the wiring diagram.

F2 means there's an error with the tube temperature sensor. If you look at the wiring diagram (BTW: there's a wiring diagram inside on the back. More on that later.) you'll see the tube sensor represented.

There are three places where there are electronics on the FDL50S1: two small plastic boxes containing circuit boards on the inside lower left as you're looking in the back and under the top plate where all the buttons are. The connection to the tube sensor is under the top plate.

But wait. It's HARD to get the 50S1 open.

Here's how I did it.

The sides have to come off before the back, even though the back is screwed onto the sides. The top has to come off anyway so you take off all the screws. As I recall, there are six in the back, 3 on each side and 4 on the top. Two of the three on the sides are obvious. But #3 for each is on the inside of the bucket chamber. So you have to remove the bucket. The 4 on top are obvious.

One of the sides has 2 LEDs to show power and bucket. So when you pull that side off, be gentle and disconnect the LEDs.

The sides have a keyed flange holding them to the front. So you have to lift and pull them out once they've been unscrewed.

The order they come off is: sides, back, top. The top has the electronics IN it so it's connected to the rest of the unit with the wires as well as the screws. So you need to make sure you're gentle here, too.

Once you have the top off, you can see the printed circuit board where the electronics are. It's held on by 6 or 8 screws and comes off easily one they are removed.

Once you turn it over, the connector for the tube temp sensor is clearly marked. At least it was on mine.

Now here's the kicker. It turns out the connectors are cheap. All I had to do to fix this was pull it out and reseat it. That was it and it worked fine.

GOOD LUCK!

Posted on Apr 11, 2010

  • Tom Wolan Jul 07, 2012

    Thanks for the tip. I tried that out and I even went as far as to pull out and reseat all of the leads at both boards and I still ended up with the F2 error. It kicks in and runs once in a while but it spends more time in the error function than it does running. I'm purchasing a non-Frigidaire replacement today.

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I was able to fix the F2 error on my FDL50S1 humidifier by "tricking" the machine into thinking it had a working tube temperature sensor thermistor. My solution should be attempted after "fsteve's" solution of opening the machine and pulling out / re-seating the tube temp sensor from the main circuit board. In short - my solution is to replace the tube temperature sensor thermistor with a 1000 ohm / 1/2 watt resistor.
A thermistor is effectively a resistor that changes resistance with temperature. As such: the machine will run as long as the tube temperature connection circuit is completed with a resistance falling within a certain range. To accomplish this I cut the wire leading from the circuit board to the tube temperature sensor thermistor, separated and striped the wires (so that the metal internal wire was exposed), and connected it to a 1000 ohm / 1/2 watt resistor. This resistor can be purchased at radio shack (5 pack for $1.50). Other resistance / power resistors may work, however I know the 1000 ohm / 1/2 watt resistor to work. To connect the resistor to the exposed metal wires (that used to lead to the tube thermistor) i wrapped the metal wire around the two sides of the resistor, folded over the metal coming out of the resistor, and soldered it together on both sides. If soldering is not possible, hot glue / tape should work. I do not believe it matters which way the resistor is connected, however i would test the machine with the resistor connected prior to permanently connecting it (the machine can be turned on with the sides / back / top removed). NOTE: this will make the machine run and dehumidify, however I am unsure as to exactly how it effects the operation and safety of the machine. I have had no trouble since doing this, however I would pay extra close attention to your machine and not run it for long periods of time. Although the machine works without the tube temperature sensor thermistor, if it did not serve some purpose it would not be there to begin with.

Posted on Jun 11, 2013

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F2 error code on Frigidaire dehumidifier model FDL50S1. how do I fix it.

Posted on Jan 22, 2010

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