Aprilaire dehumidifier not working

Are you dealing with a sleepy, humid home? A dehumidifier is the solution. But if your Aprilaire dehumidifier isn’t working, don’t fret. It’s a common issue that can be solved with some basic troubleshooting steps.

When Aprilaire dehumidifier not working, the key aspect is to comprehend the underlying issue causing the problem. This necessitates an understanding of the error codes to identify the specific concern at hand.

In this blog post, we’ll explain why your Aprilaire dehumidifier might not be performing as expected and how you can troubleshoot it. With a few simple steps, you’ll be able to pinpoint the source of the problem and get your dehumidifier back up and running in no time!

Aprilaire Dehumidifier Not Working

Aprilaire dehumidifier not working:

Some common reasons why your Aprilaire dehumidifier may not be working include are as follow:

  • Error code of Aprilaire dehumidifier
  • Water Leaks
  • Circuit Breaker Trips
  • Fan Does Not Function
  • The coil of Aprilaire Dehumidifier is frost
  • Loud Noise

Error code of Aprilaire dehumidifier:

When your Aprilaire dehumidifier is not operating properly, it’s important to look at the error codes. The code will help you diagnose the issue and figure out what needs to be done in order to get it running again.

Aprilaire Dehumidifier Not Working the first cause are error coads

This code indicates that there is a problem with the dehumidifier’s. All the code for an Aprilaire dehumidifier are as follow:

  • E1 – Internal RH/Temperature Sensor open or shorted
  • E2 – High Refrigeration Pressure
  • E3 – Remote Control Communication Loss
  • E4 – Insufficient Capacity
  • E5 & E6 – Temperature Sensor Failure
  • E7 – Float Switch Open
  • E8 – Inlet Air Temperature or Dew Point Out of Range
  • E9 – Outdoor Temperature Sensor open or shorted

E1 – Internal RH/Temperature Sensor open or shorted:

An E1 error code on your Aprilaire dehumidifier means that the internal RH/Temperature sensor is either open or shorted. This is an important piece of information for the dehumidifier’s central computer, as it helps to determine how warm or cool the area is. If there are any issues with this sensor, your device won’t be able to adjust accordingly, resulting in inaccurate humidity levels.

E2 – High Refrigeration Pressure:

When you see the error code E2 on your Aprilaire dehumidifier, it means that the discharge line temperature is too high. The usual cause of this problem is either an overly warm air input or insufficient airflow going through the unit. If your compressor has restarted five times and the error persists, it’s time to take action.

Before you start troubleshooting, make sure that the intake and exhaust vents on your dehumidifier are clear so they can properly circulate air.

E3 –Remote Control Communication Loss:

E3 –Remote Control Communication Loss is an issue that can occur with your Aprilaire Dehumidifier. It means that the dehumidifier’s model 76 control has stopped communicating with it, and this can be a tricky problem to troubleshoot. Even though it might seem easier to try and fix the issue yourself, you should take extra caution when dealing with high voltage equipment. If you don’t feel completely comfortable, it’s best to get help from a professional as they know how to handle these types of issues safely and effectively.

E4 – Insufficient Capacity:

If you’ve recently seen the E4 – Insufficient Capacity error code on your Aprilaire Dehumidifier, don’t worry – there are a few steps you can take to try and resolve it.

The most likely cause of this error code is that the dehumidifier was transferred from somewhere cold to somewhere warm. This is because the dehumidifier can become overworked if the air is too hot, leading it to display this error code. If this is the case with you, try waiting for roughly an hour before checking again.

If you continue to see the E4 – Insufficient Capacity error code after that, chances are some troubleshooting work may be needed. Be sure to consult your user manual or contact the manufacturer’s customer service team for additional assistance. With that being said, you should be able to get your dehumidifier up and running again in no time!

E5 & E6 – Temperature Sensor Failure:

If you’ve ever seen an E5 or E6 error code on your Aprilaire Dehumidifier, it means that the signal to the high temperature or low temperature sensor is shorted. This can happen if there’s a loose connection on one of the circuit boards or a failed sensor.

It’s important to note that this kind of error requires electrical work. If you’re comfortable with this type of task, feel free to follow the instructions provided by the manufacturer. However, if you don’t have the experience or know-how then it’s best to call a professional for help.

E7 – Float Switch Open:

The E7 error code of Aprilaire Dehumidifier indicates that a float switch has opened due to water accumulation in the unit’s drain pan. This means that your dehumidifier has detected too much water and is preventing it from collecting and storing more water, thus protecting your home from potential water damage. To fix this issue, you will need to follow the instructions provided by the manufacturer. This might include emptying out the water from the drain pan and cleaning it, or using a shop vacuum to remove any obstruction from the drain tube.

E8 – Inlet Air Temperature or Dew Point Out of Range:

The E8 – Inlet Air Temperature or Dew Point Out of Range error code on your Aprilaire Dehumidifier can be a real headache. This code means that the temperature of the air in your home is too extreme, either below 50 degrees F or above 104 degrees F, or the dew point is lower than 40 degrees F. When these temperature extremes are detected, it’s a sign that something isn’t right and your unit can suffer if left unchecked.

That said, there is an easy fix: make sure you keep the dehumidifier in a space with temperatures within its operating range. If the temperature of the air around your unit is too hot, move it somewhere cooler to help bring the temperature down. Likewise, if it’s too cold for your unit, then you can move it higher up to a warmer spot.

E9 – Outdoor Temperature Sensor open or shorted:

E9 – Outdoor Temperature Sensor open or shorted error code of an Aprilaire Dehumidifier can be a bit challenging to deal with. This error is typically triggered when the temperature registered on the outdoor temperature sensor is out of range, which is usually due to either actual cases in which the temperature is indeed out of range, or a failed sensor or loose connection. Sometimes, this error code is only triggered when the ventilation feature has been enabled.

If you suspect that your Aprilaire Dehumidifier is producing an E9 – Outdoor Temperature Sensor open or shorted error code, it’s best to be proactive and take steps to diagnose the issue right away.

Water Leak problem of Aprilaire Dehumidifier:

Water leaks in Aprilaire Dehumidifiers can be a major problem, and it’s important to take the necessary steps to identify and address them.

Aprilaire Dehumidifier Not Working when it liking the water

Here are a few tips to help you diagnose and fix the issue:

  1. Make sure that the unit is leveled front-to-back and side-to-side, and check that any hard pipe or drain fittings are securely glued to the drain pan outlet.
  2. Clean or replace the drain tubing, ensuring it has a steady downward slope to the drain.
  3. Remove the side panel, and slowly pour a pint of water into the drain pan near the return bends of the coils. Allow time for the running trap to fill up, and look out for any signs of leaks from the drain pan or tube. Unplug the drain afterwards.
  4. Plug or raise the drain tube high enough to prevent water from pouring out. Slowly pour an additional pint of water and allow it to stand in the pan for 15-20 minutes. Check again for any leaks.
  5. Replace the side panel and test the unit for proper operation.

By following these steps, you can be sure that your Aprilaire Dehumidifier is functioning properly and that water leakage is a thing of the past.

Fan Does Not Function of Aprilaire Dehumidifier:

  1. First, check to make sure the dehumidifier is plugged into a live outlet providing 120 VAC of power.
  2. After confirming that it has access to a live outlet, turn off both the control and toggle switches.
  3. Remove the side panel of the device and disconnect the blue and yellow fan wires from the internal control board.
  4. Inspect the large disk component (called a varistor) on the internal control board next to the fan terminals. If it looks scorched or cracked, replace the internal control board entirely (5444).
  5. Turn the toggle and control switches back on, and make sure that the fan LED is lit and there is 120 VAC available at the fan terminals. Be careful when handling these terminals, as they carry line voltage.
  6. Disconnect the fan run capacitor and measure its capacitance; it should be 6 µF ±5% for 1830 with Serial Number 112015A09596 or later, 8 µF ±5% for 1830 with serial numbers before 112015A09596, 12 µF ±5% for the 1850, 10 µF ±5% for the 1870, 8 µF ±5% for the 1870F.
  7. If the capacitor is bad, replace it (5459 70pt before 112015A09596 / 5582 70pt 112015A09596 or later / 5468 95pt / 5573 1870/ 5459 1870F). If it is good, replace the fan itself (5453 70pt / 5467 95pt / 5572 1870/ 5588 1870F).
  8. After replacing either the capacitor or the fan, turn on both control and toggle switches of the dehumidifier to check if there are any further issues with proper functioning.
  9. If the fan still does not work after performing the steps above, please contact Aprilaire’s technical support team and they will be more than happy to assist you.

We hope this guide has been helpful in helping you troubleshoot your Aprilaire dehumidifier!

Cleaning The Air Filter:

  1. Unplug the power cord of the dehumidifier before attempting to clean the air filter.
  2. Turn off the ON/OFF toggle switch and turn control OFF.
  3. Locate the air filter; it’s typically located in either the front or side of the unit, depending on your particular model of Aprilaire Dehumidifier.
  4. Carefully remove the air filter.
  5. Inspect and clean any debris found in the mesh of the air filter with a vacuum cleaner or simple cloth.
  6. Reinstall the air filter back into its original position before turning the unit back on; make sure all clasps are securely fastened, as this helps prevent dust from entering your home’s atmosphere.
  7. After turning the unit back on, check for proper functioning and make sure the air filter light is off.
  8. If the light remains illuminated despite recent cleaning, please contact Aprilaire’s technical support team and they will be more than happy to assist you.

We hope this guide has helped you in properly cleaning your Aprilaire dehumidifier’s air filter!

Circuit Breaker Trips of Aprilaire Dehumidifier:

A circuit breaker is a vital piece of equipment in any home, protecting both the electrical system and the people who live there. But sometimes these breakers can trip, leaving your Aprilaire Dehumidifier unable to run.

Aprilaire Dehumidifier Not Working when the circuit is break

Here are a few things you should check when your circuit breaker trips:

  1. Make sure the outlet is served by a 15 amp circuit breaker – All 1800 series Aprilaire Dehumidifiers must be plugged into an outlet with this type of breaker.
  2. Check for other components that draw a lot of current on the same circuit – If there are other electrical components that draw a lot of current connected to the same circuit, it may be overloaded. In this case, you should consult with an electrician for help.
  3. Check your wiring connections – Make sure all the wires in the dehumidifier are securely connected. If none of them appear to have come loose, then proceed to step 4.
  4. Check your run capacitor – At this point, you’ll need to measure the capacitance of your compressor run capacitor with a multimeter tool. It should be 45 µF (microfarad) ±5% for the 70/95pt dehumidifiers and 50 µF (microfarad) ±5% for the 135pt dehumidifier. If the reading is outside of this range, then you should replace your capacitor.
  5. Finally, once all these checks are complete and you have replaced any faulty components, you can turn everything back on and reset your breaker to see if it trips again.

If you’re still having trouble with the circuit breaker tripping after doing all this, or if you don’t feel comfortable attempting this yourself for any reason, then contact Aprilaire customer support for further assistance.

The coil of Aprilaire Dehumidifier is frost:

If the coil of your Aprilaire Dehumidifier is frosting, this could be due to an issue with the defrost feature. The defrost feature helps keep the dehumidifier from running at times when frost or ice can form on the evaporator. If not addressed, this could lead to a lack of potential dehumidification as the dehumidifier will end up running to its set point but unable to draw moisture from the incoming air.

Aprilaire Dehumidifier Not Working when the coil is frost

To determine if a lack of airflow is causing the defrosting condition, make sure your dehumidifier’s filter is clean and lightly loaded, and that the external static pressure or airflow of your dehumidifier is within an acceptable range. If the defrosting is due to low incoming air conditions, then the RH setting might be too low for those conditions.

Aprilaire has made a change to its defrost operation with V1.3 of the internal control board. Starting at serial number XXXXX, the dehumidifier will enter Defrost Mode when the suction line has been at 32°F for 2 hours. This change helps improve capacity at low load conditions (60°F / 60%RH). If you have an earlier model that’s constantly cycling on defrost, the Internal Control Board should be replaced (5444).

The Noise level of Aprilaire Dehumidifier is loud:

The noise from your Aprilaire dehumidifier can be loud, and it is important to determine the cause of this. If you are experiencing a loud noise that isn’t caused by other components such as fan or compressor, check the filter drier clip to make sure that the screw holding it in place isn’t touching the surface on which it has been mounted.

Aprilaire Dehumidifier Produce Loud Noise

Some dehumidifiers have a screw that can contact the mounting surface if the feet of the unit are raised fully. To avoid this, lower the feet so that there is clearance from the surface. If you still experience loud noise after making these adjustments, make sure to call your local Aprilaire service provider for assistance.


We hope this blogpost has been helpful in providing you with some guidance on how to troubleshoot some of the most common issues that can prevent your Aprilaire Dehumidifier not working properly. Remember, if at any point you feel uncomfortable attempting these solutions yourself or need additional help, then please do not hesitate to contact Aprilaire’s support team for assistance.

Related F.A.Qs:

How do I reset my AprilAire dehumidifier?

In order to reset your AprilAire dehumidifier, you’ll need to switch off the power at the circuit breaker and unplug your unit from the wall. Wait for five minutes before plugging it back in again. Once plugged in, turn on the power at the circuit breaker and then press and hold the ‘Reset’ button until you hear a single beep. Your unit should now be reset.

What causes a dehumidifier to stop working?

The most common cause of a dehumidifier not working is a dirty air filter; if your filter is full of dust and dirt, it can clog the device and prevent it from running correctly.

Can a dehumidifier be repaired?

In most cases, a dehumidifier can be repaired. Common repair issues include cleaning or replacing the air filter, replacing the fan motor, and checking for any loose wiring connections. If none of these solutions work, then it may be time to contact a professional for help.

How do I service my aprilaire dehumidifier?

Servicing your Aprilaire Dehumidifier regularly will help keep it running in the best possible condition. To do this, first unplug the unit from the wall and clean the filter according to manufacturer instructions. Periodically inspect for any loose wiring connections, clogged drains, or other damage that may need to be repaired. 

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