Question about Comfort-Aire BHD-501 Dehumidifier

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Fault Codes My Comfort-Aire BHD-501 Dehumidifier is displaying a Fault Code: CH 01. It won't power up with the power switch. If I unplug the unit and plug it back in, the fan starts to rune then it shuts down and displays the fault Code. All the switches seem to be working properly. Of course, the one year warranty just ran out!

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  • aerograf Jul 18, 2008


  • Peeved Sep 20, 2008

    Robster08, I did as you suggested and the unit did indeed remove the trouble code and begin to operate. I also noticed that as I moved the wires to the thermistor, I could make the trouble code come and go. I **** the black sleeve and cut the wires to the thermistor about three inches from the end of the thermistor, then reattached them. The unit has been working flawlessly for three days now. Any idea where to get a replacement part?



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This is more of a tip since I have not actually fixed anything yet. As a test, remove the upper front cover where the buttons and displays are. (2 screws on the bottom then pull off a the plastic snaps) Inside the case on the far left, there is a piece of crimped copper tubing, open on the top end, welded to the refrigerant line, with a black sleeve covering 2 wires out the bottom end. This is a thermistor. I CAREFULLY applied heat with a butane lighter (the mini torch kind, not the "candle flame" kind), taking care not to burn anything. I applied ONLY enough to make it slightly warm to the touch. Do not think of melting anything, as this is not the purpose. Applying too much heat could damage the thermistor. With the bucket in place, the unit started right up. After I did this, it failed again in a few minutes, so I heated it again, and thus verifying it as the source. I have done it a third time, never getting it much over room temperature, and it is still running after almost an hour after doing nothing else. Since this temperature sensing is an analog function to the microcontroller that runs everything, the fault could be any bad connection or solder joint along the way from this thermister to the controller. But is sure appears something in thermistor. I hope my description is complete and clear. Good luck.

Posted on Sep 16, 2008

  • Robster08 Sep 16, 2008

    I should have said that I applied the heat to the crimped copper tube. Sorry about the typos. Robster08

  • Robster08 Sep 22, 2008

    The fact is, I picked this dehumidfier up on the curb with a FREE sign on it, so I do not have any owners info about parts availability. I did not remove the thermistor or sleeve, so I don't know the condition of the part, if there is a generic thermistor that would work, or if it is a thermistor. (There goes my rating!) I'm not NASA and I didn't care how reliable it might be. It worked without needing parts and that to me was the best outcome possible. Mine has not failed again after my first post. If it does, I might look at the connections to the part like you did or then for replacement parts. I try not to do more work than I have to. Since the unit could put up a fault code, I assumed the controller was basically working. I began with the bucket full switch, because the led was blinking, but it checked out as good. Then I tried to see if the other input devices worked as expected, in this case, heating and cooling the thermistor. Doing that led the the fix I posted. I'm glad my findings helped you. I was quite lost with it at first. There was little help to be found on the internet, and what there was, was not complimentary to the manufacturers customer service. This web site was a great idea. What a waste it would have been to throw such a thing away for so small a reason!



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