Maytag Neptune Dryer Diagnostic Mode (3 Ways to Enter!)

The good thing about Maytag Neptune dryers is that you can put them on service or diagnostic mode to identify an error code and know what’s wrong with them. So, how do you enter the Maytag Neptune dryer diagnostic mode? 

You can put the Maytag Neptune dryer in diagnostic mode by pressing Signal + Temperature or Air Fluff + Time for 3 seconds while the dryer is on standby mode or Chime + Temperature for the same duration while the dryer is on.

Once you view the error code (if any), you can exit the self-diagnosis or service mode and then act on the code. Thus, you must know how to interpret the error codes or research them online.

To help you, I’ll discuss the various Maytag Neptune dryer error codes that may pop up on your dryer display. You’ll learn its meaning or cause and how to clear it (fix the dryer).

Let’s get into it!

Maytag Neptune dryer diagnostic mode

In a hurry? Check out the quick shortcuts for putting the Maytag Neptune dryer on diagnostic mode and exiting it in the table below.

Guide to Entering the Maytag Neptune Dryer Diagnostic Mode

Quick Entry into the Diagnostic Mode  Quick Exit Out Of Diagnostic Mode 
1. Press Signal + Temperature for 3 seconds while the dryer is on standby  Press Sensor Dry Level + Time for 3 seconds after the dryer enters service mode 
2. Press Air Fluff + Time for 3 seconds while the dryer is on standby  Press Off or Air Fluff + Wrinkle Release after the dryer gets into the service mode 
3. Press Chime + Temperature for 3 seconds while the dryer is on  Press Off to get out of service mode 

But How Do You Run a Diagnostic On a Maytag Neptune Dryer?

As far as running diagnostics on a Maytag Neptune dryer is concerned, you can do it in any of these three ways:

1. ‘Signal + Temperature’ Diagnostic Mode 

You can self-diagnose most Maytag Neptune dryers using this technique, and here are the steps to do it: 

  • Put the Neptune dryer on standby (ensure its power cord is plugged in, but the dryer should be off)
  • Hold the Signal + Temperature buttons on your dryer for 3 seconds to enter the service mode 
  • View the error codes that pop up (you can even note them down quickly)
  • Once the error codes disappear from the screen, release the buttons
  • Press Sensor Dry Level + Time on the dryer from 3 seconds to exit the diagnostic/service mode.

2.  Air Fluff + Time Diagnostic Mode 

You can also enter the service mode using the Time and Air Fluff keys instead of the Temperature and Signal keys. Here’s how to go about it: 

  • Put your dryer on standby mode and press Air Fluff + Time for about 3 seconds or until the dryer beeps
  • Wait for the letter d to pop up on the screen to show that the dryer is now in the service mode
  • Then note any error codes that pop up
  • Press Off to get out of the service mode if there are no error codes
  • If there are error codes, press Air Fluff + Wrinkle Release to get out of Diagnostic mode

3. Chime + Temperature Diagnostic Mode 

Instead of pressing Signal + Temperature, you can press Chime + Temperature on your Neptune dryer to get it in service mode. Here’s how to go about it:

  • Turn on the dryer (Don’t put it on standby)
  • Press Chime + Temperature for about 3 seconds or until the dryer beeps to enter the dryer in Service mode. 
  • Note any error code on the display 
  • Press off to get out of the diagnostic mode

While in the diagnostic mode, press Wrinkle Prevent + Time for 3 seconds to enter the System Check Mode, which allows you to determine any system fault. You can get out of the System Check Mode by pressing OFF.

How do you run a diagnostic on a Maytag Neptune dryer

Maytag Neptune Dryer Troubleshooting Codes

After running diagnostics on your Maytag Neptune dryer, you’ll likely get an error code that tells you what’s wrong with your dryer. Now that you have the error code, how do you interpret it?

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Well, here’s a guide to troubleshooting typical Maytag Neptune diagnostic codes:

1. ‘Check Vent’ or AF Error Code or Code F4E3

The Check Vent F4E3 or AF error code indicates restricted airflow associated with a clogged vent or lint screen. The vent could also be kinked or crushed or have many elbows. 

So, you’ve to inspect the vent for any blockage and clear it to facilitate airflow. 


You need to check the lint filter for dirt clogging and clean it. Then move the dryer vent and clean it too if it’s clogged, remove any kinks and if it’s crushed, replace it.

2. Error Code 01

The error code 01 shows a problem with the thermistor. It could be that the thermistor is defective or appears so when it’s not due to a clogged exhaust vent. So, you should check the thermistor and the exhaust vent too. 


Start by inspecting the exhaust fan for clogging. If it’s blocked, unclog it, but if nothing is wrong with it or the error won’t clear after unclogging it, replace the thermistor. 

3. Error Code O2 (Neptune Maytag Dryer Not Heating)

The error code 01 indicates that the Maytag Neptune dryer is not heating. The reason could be a failed power supply due to a tripped breaker, a partially opened gas valve, power loss, or a failed heating component such as the heating element. So, you’ve to consider all these factors. 


Consider unplugging and plugging back the dryer to ensure it will start. While at it, reset the breaker if tripped and ensure there’s no power loss. And if the dryer is gas-powered, ensure you fully open the gas shutoff valve. 

4. Error Code L2, F4E4, or F31

The error code L2 or F4E4 pops up when there’s an issue with the power supply, preventing the heater from switching. So, while the dryer may turn on, it won’t get hot.

Sometimes, the source of the power failure is a loose cord, tripped breaker, or overheated fuse. So, you need to check them to ensure they aren’t disrupting the dryer’s power supply. 


Check the dryer to ensure it’s getting enough power. That means firmly plugging in the power cord, resetting a tripped breaker, and replacing an overheated fuse.

Contact an expert electrician if you can’t fix the dryer, and the error code won’t go. 

5. Error Code 03

The error code 03 suggests a faulty door switch or damaged door switch’s wiring harness. Thus, you must check the door switch and its wiring harness to ensure they are not defective. 


Inspect the wiring harness and door switch for breakages and damages; if any of them look faulty, replace them. 

6. Error Code 04 

Error code 04 suggests a control board or drive motor fault. Either part could be faulty, or it could be the case of loose wiring, causing the components to malfunction. 


Check the wiring harness for looseness or damage and replace it. But if the wiring harness is okay, replace the control board. 

7. ‘Check Lint’ Error Code

The ‘check lint screen’ or ‘check lint’ indicator light will come on when the lint screen is filthy. If so, you need to check the lint screen for dirt clogging. While this error code may not prevent the dryer from starting, it may not heat up or dry your clothes.

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Check the lint screen as the error code indicates and wash it with soapy water. Then check the outside vent for clogging and clear it. It could be the reason the lint screen is blocking.

8. Error Code PF

The error code PF stands for power failure. So, you ought to check the dryer for possible power interruption, which can be an outage, tripped breaker, or electrical fault. 


Confirm if there’s an outage. If there isn’t, check the breaker to see if it’s off. If it is, flip it back on. But if the breaker is not the issue and there’s no outage, control a certified electrician to check and fix any electrical fault. 

9. Error Code 08

Lastly, the error code 08 pops up to indicate a stuck control panel key. Such a key renders the control panel non-working. 


Inspect the control panel for any stuck keys and press them on the side to release them. But if the buttons are faulty or the control panel won’t become responsive, replace the control panel. 

10. Error Code F3E2

The error code F3E2 pops up when the dryer dries up five loads successively without registering any moisture sensor information. 


Clear this error code by pressing the power button and restarting the dryer. If the error doesn’t clear, contact an expert technician. 

11. Error Code F1E1 to F1E5

The error code F1E1/F1E3/F1E4/F1E5 indicates a control unit fault or an issue with its associated wiring. So, you need to reset the dryer to fix the control board. 


Consider resetting the control unit by pressing power on the dryer and selecting a new cycle. After that, press the start/pause button for a few seconds. But if the Neptune dryer won’t reset, unplug it for 30 minutes or so to hard reset it. 

Maytag Neptune dryer troubleshooting codes

12. Error Code F6E2/6E/F01/F02/F22/0E/E1/E2/E3/F6E3/F29/F50/F70-F78

Any above error codes indicate that your dryer needs a reboot or reset. 


Reset your Neptune dryer by unplugging it for at least 5 minutes. The code should clear after the reset once you plug it back in and turn on the dryer.

Remember, you can also reset the dryer by flipping the circuit breaker off for at least 1 minute and starting a Time Dry cycle. 

People Also Ask 

1. How Do You Put a Maytag Dryer in Diagnostic Mode? 

You can put most Maytag Dryers in diagnostic mode by pressing Air Fluff + Time for about 3 seconds or until the dryer beeps. Before entering the diagnostic, the dryer must be on standby mode (plugged in but off). 

2. Why Is My Maytag Neptune Dryer Not Starting?

Your Maytag Neptune dryer is not starting because the start button is faulty, the dryer lacks power, the door is defective, or due to a locked control panel (or control lock). The setting could also be wrong, or an essential component like the drive motor could be bad.

3. Why Is My Maytag Neptune Dryer Not Drying?

Check the lint screen for dirt clogging when the Maytag Neptune dryer won’t dry. Also, inspect the dryer vent for the same (clogging), kinking, crushing, or many elbows, which could be limiting airflow.

Where can you purchase OEM parts for Samsung dryers?

You can conveniently purchase OEM parts specifically for Samsung dryers from both AppliancePartsPros and RepairClinic. Notably, both companies offer a 365-day warranty on all parts, ensuring that you receive reliable and high-quality components for your appliance. Rest assured that these warranties are provided at no additional cost to you.

Are error codes something that appear when you first start the dryer?

Error codes can appear on the display panel of certain dryers, including Samsung models, to indicate potential issues or malfunctions. However, since I am not extensively familiar with Samsung dryers, I am unable to provide a definitive answer to your question. It would be best to consult a Samsung technician who frequently deals with these specific dryers and is well-versed in their functionality. They should be able to provide you with the accurate information you seek.

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What could be the issue if a Samsung dryer runs but doesn’t heat?

How can I troubleshoot and fix the issue of a running but not heating dryer?
To troubleshoot and fix a running but not heating dryer, you can follow these steps:

What could be the reason for my dryer running but not heating?
If your dryer runs but doesn’t heat, it is likely due to a power issue. The dual breaker in the house breaker box may be tripped, resulting in the dryer only receiving 120 volts instead of the required 240 volts. Another possible reason could be a faulty or burnt wire in the access panel where the power cord wires mount on the dryer terminal block.

What should I check if my dryer runs but doesn’t heat?
If your dryer runs but doesn’t heat, there are a few things you can check. Start by checking the dual breaker in your house breaker box. If one breaker is tripped and the other is not, it can result in the dryer only getting 120 volts instead of the required 240 volts to heat. Additionally, you can check the voltage at the terminal block where the dryer power cord hooks up. Use a multimeter to check for 240 volts across the two outer terminals. If there are any burnt wires in the access panel where the power cord wires mount, that could also be the cause.

If you are experiencing a situation where your Samsung dryer is running but not producing heat, there are several potential issues that could be causing this problem. Here are some troubleshooting steps to consider:

1. Error Code PF: This error code indicates a power failure. It is important to check for any power interruptions, such as an outage or a tripped breaker. Additionally, an electrical fault could also be the culprit behind the lack of heat.

2. Error Code 08: This error code specifically points to a stuck control panel key. When a key on the control panel gets stuck, it renders the entire panel non-functional. In such cases, it is necessary to address the stuck key issue to restore proper functionality.

3. Error Code F3E2: If your dryer has dried up five consecutive loads without registering any moisture sensor information, the error code F3E2 may appear. This indicates a potential problem with the moisture sensor and may require further investigation or maintenance.

4. Error Code F1E1 to F1E5: These error codes suggest a fault in the control unit or an issue with its associated wiring. To address this, a simple reset of the dryer can often fix the problem. Try unplugging the dryer for at least 5 minutes and then plug it back in to clear the error code.

5. Error Code F6E2/6E/F01/F02/F22/0E/E1/E2/E3/F6E3/F29/F50/F70-F78: Any of these error codes may indicate the need for a reboot or reset of your dryer. To perform a reset, simply unplug the dryer for a few minutes and then plug it back in. This should clear the error code and potentially resolve the heating issue.

It is worth noting that while these error codes provide insight into potential problems, they may not directly address the specific issue of a running dryer that does not produce heat. For more thorough troubleshooting, it is recommended to follow the steps outlined in Their article. This includes checking the dual breaker, inspecting the terminal block for voltage, and examining for any burnt wires in the access panel. By following these additional steps, you can further pinpoint the cause of the heating problem and take appropriate action to resolve it.<

Closing Remarks On the Maytag Neptune Dryer Diagnostic Mode:

Above are the three ways you can put your Maytag Neptune dryer on diagnostic or service mode and exit it. So, consider them when your dryer malfunctions and you can’t explain why. And once you get the diagnostic code, use the above guide to troubleshoot the dryer.