Question about Holmes Products (048894556579) 4 Gallon Humidifier

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Will not reset

I have a Holmes HM8405. I am trying to get it running this year. Replaced the filter. Reset light will not go off for anything. Any ideas?

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Re: will not reset

Per the operators manual you have to reset it. 1. Unplug the unit
2. Remove and refill the water tank, being sure to follow the Daily
Maintenance Instructions. Replace the tank onto the base.
3. Wait 5 minutes for the Automatic Shut-Off to reset.
4. After the 5 minutes, plug in the unit and turn the unit on to HIGH
(HI). The RESET light should now be off (if not repeat steps 1 through
3). In about 2-3 minutes, the humidifier will begin to produce

Posted on Dec 27, 2008

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Hi there,

The tank may be full. Your dehumidifier has a safety device that turns off the dehumidifier when the water tank is full. Usually the tank itself either presses against a switch or there's a device connected to the tank that triggers a switch when the tank is in place and full.
If you've emptied the tank and the unit doesn't run, inspect the place where the tank rests to see if there's a switch or mechanism that's not being activated. You may be able to turn it on with a simple flick of your finger.

Post comments  for more help or information .........

Good Luck!!


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Humidifier does not reset

According to Holmes, one of the causes of the Reset light staying on is scale buildup on the heating element.

Remove Scale: Allow to cool before maintenance.
1. Repeat steps 1-5 in the Daily Maintenance section.
2. Clean the base by partially filling the base with one
8-oz cup of undiluted white vinegar. Let solution stand
20 minutes, cleaning all interior surfaces with a soft
brush. Dampen a cloth with undiluted white vinegar
and wipe out entire base to remove scale.
3. Rinse with clean warm water to remove scale and the
white vinegar solution before beginning to disinfect
the tank.
4. Wipe the heating element clean with a soft cloth after
it has had chance to cool.

If the scale has really built up it might take longer than 20 mins for the vinegar to get rid of it and you might need to refresh with new vinegar.

Your Manual can be found at this link:

Good Luck.

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