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What is the Dehumidifier F0 Code ?

You could argue that we’ve only been selling dehumidifiers in the US for the last few years, but our history stretches back much farther. We’ve been selling TOSOT appliances in European, Middle Eastern, and Asian markets for more than twenty years, so believe us when we say we know a thing or two about dehumidifiers.

One of the most common complaints we’ve seen in the dehumidifier market, regardless of brand, relates to the F0 malfunction code. In this article, we’re going to break down what the F0 code means, some tips on how to resolve it, and what we can do for you if you see an F0 malfunction code on your dehumidifier.

To understand what the F0 code really means, we first need an idea of how a dehumidifier works.

How Does a Dehumidifier Work?

For the sake of simplicity, imagine that your TOSOT dehumidifier works kind of like a vacuum cleaner.

A vacuum cleaner uses a motor to spin a fan to suck in air, remove dust and dirt from that air, and then blow air back out of the vacuum.

A dehumidifier uses a motor to spin a fan to suck in humid air, remove moisture from that air, and then blow dry air back into the room again.

To remove humidity from the air, moist air is passed over a refrigerated cooling coil. Moisture from the air collects on the refrigerated copper cooling coils the same way that water collects on the outside of an iced beverage on a hot day: condensation.

As the water condenses on the refrigerated coils it drips off of the coils and is collected in the drain bucket of your dehumidifier. If you have the continuous gravity drain connected to your unit, collected water will bypass the drain bucket and flow directly out the gravity-fed hose. If you have an internal pump model, water will collect in the bucket and then automatically be pumped out of the bucket once the bucket is about 85% full.

While water collects in the drain bucket, the now moisture-free air is reheated so it can be blown out the top of the unit and back into your room.

Now that we’ve discussed how a dehumidifier works, let’s move onto the F0 malfunction code.


What does the F0 Code Mean?

All TOSOT dehumidifiers are equipped with a self-diagnosis function which is displayed on the control panel. This allows you to diagnose the error code and solve the issue yourself; sometimes it’s as easy as removing and cleaning the filter on your unit!

This self-diagnosis function also lets you tell our customer service team which malfunction code is displayed on your control panel so we can help get your dehumidifier working again.

Malfunction code F0 is an error code that means your dehumidifier is low on refrigerant, typically caused by a leak in the enclosed refrigerant system.

In order to remove this error you would have to find the leak, safely remove all remaining refrigerant in the unit, repair the leak, and then refill the system with refrigerant.

This is not a procedure that we recommend, nor do we take any responsibility for telling you this information. If you keep reading we will help you solve this problem, but for right now we just want to provide you with some background information. Moving on!

Since the refrigerant leakage progresses slowly and won’t immediately stop the machine from functioning, some of our competitors have configured their dehumidifiers to keep working even after the F0 error code appears to cut down on return requests from customers.

Although your dehumidifier is still “technically” working in this case, it will have a much lower dehumidification performance, will waste electricity, and may have an increased risk of serious malfunction or damage. It’s not the most honest practice, and it is one that we do not follow.

At TOSOT, we are a responsible and reliable brand with more than 20 years of experience in dehumidifier and air conditioner manufacturing. We highly value your safety and designed our dehumidifier setting to immediately stop working after F0 error shows.

We know this can be a little annoying for you, but we do it because your safety is our top priority. Our team all uses TOSOT appliances in our own homes, so we would never sell you anything that we consider unsafe or could waste your hard-earned money. We’re all in the same boat here.


How to Solve the F0 Code

First off, we don’t recommend you disassemble the unit and start trying to Macgyver your dehumidifier back to health.

We’ve noticed a few self-proclaimed technicians offering “guides'' or “hacks” on how to solve F0 code issues. These guides suggest you disassemble the unit, remove sensors, cut wires, and do other potentially fatal or hazardous things to get your unit working again.

Although these guides may technically work, they do void the warranty of your unit and put your unit at a greater risk for fire or electrical damage. If you have an F0 code please don’t try to DIY your way back into a working dehumidifier. We have a few much better, much safer ideas.

If you receive an F0 Malfunction Code on your dehumidifier, there are a few steps you can try right now to get your dehumidifier running again:

  1. Make sure the ambient temperature in the room is between 41-90 °F
  2. Ensure the outlet voltage your dehumidifier is plugged into is 115V±10%
  3. Unplug the unit for 20 minutes and plug it in again to see if the code still appears. This may reset the internal computer and remove the F0 code, at least temporarily
  4. Try a different wall outlet, preferably an outlet which uses a different circuit
  5. Try cleaning the filter with warm, soapy water. Let the filter dry completely before reinserting into the dehumidifier

If those don’t work, read on to see what TOSOT can do for you!


How Will TOSOT Help You with an F0 Code?

If you purchased a TOSOT dehumidifier and you receive the F0 malfunction code, we are here to support you!

Although we place a great deal of emphasis on quality control, sometimes even the best products may malfunction. It’s difficult to avoid accidents happening when products are shipped halfway across the world, handled rougher than we’d like by carriers like UPS and FedEx, and then used in a variety of environmental scenarios. Each person will put different levels of care into their dehumidifier which can also affect if a malfunction arises.

If you have received an F0 malfunction code on your TOSOT dehumidifier, simply send an email to or fill out a warranty claim form and a member of our support team will be in touch to confirm some details with you. We want to get you a working replacement unit as soon as possible!

So there you have it, a complete guide to how your dehumidifier works, what the F0 code means, how to solve the issues, and what we can do to get your dehumidifier working again. If you have any other questions about the F0 code please send an email to and a member of our team will be happy to answer them for you.

1 comment

  • Paul Romney

    You don’t mention the possibility that the F0 fault arises from the formation of verdigris inside the sensor. This is something that can be fixed by cleaning the sensor.

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