Dehumidifier Troubleshooting Tips


Mustiness, mildew and mould in the home are all history if you have a dehumidifier.  The good news is that dehumidifiers do not need a great deal of maintenance but they do need a little attention every now and again.

Here are some of the maintenance tips including regular cleaning schedules and some troubleshooting ideas.

There is not much point in using a dehumidifier to keep your place free of mould and mildew just to allow it to collect inside the reservoir of your dehumidifier so that must be kept clean!


Although it has lots of parts your dehumidifier is easy to get to, the parts that attract dust and form mildew are easy to clean.

The reservoir

The reservoir can be cleaned regularly with detergent or disinfectant.

Any build-up of mould in the tank is dispersed back into the atmosphere making it airborne, not at all good for you.

Grills and filters

  • Every couple of months (minimum) clean the inlet and exhaust grilles, you can use the brush attachment of your vacuum cleaner
  • Keeping the grilles all clean and free of dust prevents any blockages
  • Clean the filter and replace it (check your owner’s manual for advice)

Guidance for placement, humidity levels and compressor care


  • You should have a minimum of 6” clearance around your dehumidifier
  • The best placement is actually in the centre of a room, hence why they may be better used at night time
  • Also ensure you have the right dehumidifier for the temperature of your home to prevent freezing or burning of the motor


Keeping it at around 50% is ideal, healthy at the same time energy efficient

Compressor protection

  • When you switch it off give it time, compressors do not like being switched off and on quickly, they need to time to reset (and overworking it in this way can cause damage)
  • Switch it off for cleaning and make sure it is given at least 10 minutes rest in order to reset the pressure

Troubleshooting DIY or Repair?

Little or no water in the reservoir

  • First check the humidistat, it may need to be turned up
  • Clean or replace the filter
  • If it still seems slow to collect water check for refrigeration issues (take for repair)

Not running

  • If the light is on but the unit is not running, first check that the reservoir is not full
  • The automatic switch may not work if the reservoir tank is not placed in position, check it is in snugly and it should resolve the issue

No air blowing out

The fan pulls cold damp air in and blows dry air out, if there is no air coming out it is most likely that the fan motor needs replacing (take for repair)

Cold frost

  • If the room and unit both feel too cold there may be a build-up of frost in the coils
  • Switch the unit off and unplug
  • There are remedies, such as moving the unit to a higher, warmer position in the property and/or switching the heating on

Very frosty

  • Automatic defrosting is a good idea if you are in a very cold climate as the alternative is switching the heating on first, it can all be a bit of a balancing act and the risks are there, you want to simplify your life not make it more complicated!
  • Look specifically for a dehumidifier with a “low temperature operation” for the best solution.

If you already have a dehumidifier then you do not need to know the benefits, you already know.

If you are thinking about ways of dealing with humidity and or condensation problems in your home take a look at for advice on dehumidifiers.

They can tell you more about mini/portable dehumidifiers using silica gel  also known as desiccant.

They can advise you on 20 or 30 pint dehumidifiers up to 70 pint dehumidifiers and the size you need to keep your home dry.

Remember dampness can attract unwanted visitors in the form of airborne particles, living spores of fungus, not to mention roaches, silverfish and centipedes.

Keep your home dry and keep it to yourselves!

But share the knowledge, use the link above to save time checking price comparisons on the internet, get the latest reviews and tell your friends!