Question about Whirlpool AD70USS Dehumidifier

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White westinghouse dehumidifier freezing up

Have used this dehumidifier for 4 or 5 years with no problem. Now I plugged it in because the basement seems damp and it freezes up on me. Is there anything that I can do, or do I have to take it in.
Thank you

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  • pstrohmeier Jun 16, 2009

    Tried the float, it still froze up. It freezes within 5 minutes of turning it on.

  • pstrohmeier Jun 16, 2009

    my model # is MDH25HW1 on the white-westinghouse that freezes up.



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I have had that problem for a while, on mine the Evaporator turns into a solid block of Ice, at first it seemed like like the room was to cold because raising the temp helped to keep it from freezing but then I found out that it has a Thermistor mounted on the evaporator, a Thermistor is a Resistor that becomes less resistive as temperature drops, when the evaporator temp gets low enough to freeze up, the Thermistor tells the control box to shut off the compressor until the evaporator temp goes back up above freezing.
I tested the Thermistor and control box on mine (hopeing I just needed a new thermistor which should be available I would think for less than $5 at a electronics supply store) by cutting replacing the thermistor with an adjutable resistor from a broken Guitar, I turned on the Dehumidifier, waited for the compressor to turn on, then adjusted the resistor from 27,000 ohms to 0 ohms and the ol'compressor just kept on'a runnin :(
So mine has a problem with the control box. If yours is just starting to freeze up then shutting off the compressor automaticaly and letting the fan run to thaw the evaporator like it should, I would try raising the temp in the room. Raising the temp of its opperating environment will directly raise the opperating temp of the evaporator and condenser and in turn help keep it from freezing up. The paperwork that came with it should give you a minimum working temp so check that too. I am going to see if I can buy a replacement control box or rigging up another temp sensor and transistor between the compressor relay and conrol box. They should have included a thermostaticaly controlled presure regulator in the system as a backup like the A/C system in some cars have.

Posted on Jan 06, 2010

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Hopefully its not the coolant pump seizing. the only simple thing that goes wrong with those is the water full switch, which turns off every thing. try playing with the float thing in the tank, you shoud here clicking of the switch on and off

Posted on Jun 15, 2009

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Your problem is,the room is too cool and too damp. Shut down the unit and let it thaw.Place the unit on a sturdy table or stand.(warmer temp off the floor)Place a small fan where unit draws air (most units draw from the rear) this will keep it from freezing the coils. After the humidity level drops after a day or so,you should be able to stop using the fan.

Posted on Jan 03, 2010

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