20 Daikin Mini Split Error Codes (Quick Troubleshooting)

You want your Daikin Mini Split to work at all times, and when it doesn’t, you should find an error code that tells you what the issue is. Therefore, I’ll help you troubleshoot typical Daikin Mini Split error codes DIY. 

In particular, I’ll discuss 20 error codes, their meaning, possible causes, and troubleshooting. And if your Daikin Mini Split does not show any code despite malfunctioning, I’ll help you get the fault code if it’s present. 

As you’ll realize, you don’t need an AC expert each time your Daikin Mini Split malfunctions. Some issues require you to find an error code, interpret it, and take the correct action. 

However, before we can look at the list, I’ll help you find a hidden error code on your Daikin Mini Split in case it hasn’t popped up despite your malfunctioning AC unit. 

After that, we’ll look at how to reset most Daikin error codes.

In a hurry? Below is a quick Daikin Mini Split troubleshooting guide for 20 common error codes:

Daikin Mini Split Error Code Chart

How Do You Find the Error Code On a Daikin Mini Split?

Sometimes, a Daikin Mini Split does not display an error code even though something is wrong. If so, you may try to find it, and here’s how to do it:

• Locate the Set button on the Daikin Mini Split remote control and hold it for about 3 seconds or until the LED lights come on
• Press Mode on the remote control twice to view any error codes (if available)
• Note down the error code and find its meaning 

Remember you can clear the error code from your Mini Split by holding Set + Mode on the remote.

How to Reset Daikin Error Codes?

Pressing Set and Mode on the remote control or the unit after viewing an error code can help clear it from the display, but that doesn’t reset the unit. If you want to reset the Daikin air conditioner unit after an error code, you should:

Option 1 – Hold Power or the on/off switch for about 2 seconds and then press it once to turn the Mini Split off and again to turn it on. 

Option 2 – Flip off the circuit breaker for 2 minutes at least, then flip it back on and power on the Mini Split. 

Daikin Mini Split Error Codes List (Top 20)

Here are the 20 most common Daikin Mini Split error codes and their meaning, causes, and fixes. 

1. Daikin Mini Split Error Code A3

(Meaning – Abnormal Drain Level)

If there’s an issue with the Mini Splits drain level, the error code A3 will pop up. Its triggers include the following: 

• Clogged or kinked drain line
• Defective drain pump 
• Defective float switch 

Fix 

Unclog the condensate line if it’s debris-clogged, and unkink it if it is twisted. Replace a damaged drain pump or float switch. 

2. Daikin Mini Split Error Code A5

(Meaning – High Pressure Heating or Freezing)

The evaporator coils and air filter shouldn’t be over-clogged. If they are, there’s a chance the error code A5 will appear. If not, the error code could pop up due to a short-circuiting or faulty heat exchanger thermistor. 

Fix 

Clean the evaporator coils and clogged air filter, and call a pro to handle the rest. 

3. Daikin Mini Split Error Code A6

(Meaning – Indoor Fan Motor Fault)

If there’s a problem with the indoor motor fan, perhaps the motor fan is damaged, the error code A6 may pop up. But still, its cause could be a motor fan wiring fault or a dead indoor PCB (printed circuit board). 

Fix 

Check the indoor fan motor for damage and replace if the motor and its wiring are okay, replace the indoor PCB. 

4. Daikin Mini Split Error Code C4

(Meaning – Heat Exchanger Liquid Pipe Thermistor Malfunction)

Expect the error code C4 to pop up on your Daikin Mini Split if the heat exchanger liquid-pipe thermistor malfunctions. That could happen because of a defective thermistor, connector point, or PCB. 

Fix 

Replace the connector points, heat exchanger thermistor, or PCB, depending on what’s faulty. 

5. Daikin Mini Split C5 Error Code

(Meaning – Heat Exchanger Gas Pipe Thermistor Malfunction)

If there’s a problem with the heat exchanger gas pipe thermistor, the error code C5 will pop up. Like in C4, the error code C5 pops up due to a defective thermistor, PCB, or contact points. 

Fix 

Replace the heat exchanger thermistor, PCB, or contact points, depending on what’s faulty. 

6. Daikin Mini Split Error Code C9

(Meaning – Suction Air Thermistor Malfunction)

The error code C9 will pop up on a Daikin Mini Split if there’s an issue with the suction air thermistor. In most cases, the components at fault are the connector points or PCB. 

Fix 

The connector points or PCB will need replacing depending on what’s faulty. So, you’ll need to check them out. 

7. Daikin Mini Split Error Codes EA

(Meaning – 4-Way Valve or Heat Switch Fault)

Your Daikin Mini Split will display the error code EA if there’s an issue with the 4-way valve or heat switch. It could be that either is defective; if not, it could be due to a defective thermistor or outdoor PCB.

Fix 

Replace the 4-way valve, heat switch, thermistor, or outdoor PCB if any of them is defective. 

8. Daikin Mini Split Error Code E4

(Meaning – Low Pressure Switch Actuation)

The low-pressure switch (LPS) will trigger the error code E4 when it becomes active, possibly due to an abnormally low pressure or defective low-pressure sensor. 

Fix 

Call a pro to check the pressure level and low-pressure sensor. 

9. Daikin Mini Split Error Code E5

(Meaning – Inverter Compressor/Motor Overheat)

If there’s an issue with the inverter compressor or motor overheating, you can expect the error code E5 to appear. Its cause could be:

• High-differential pressure 
• Faulty inverter PCB or contact points 

Fix 

Contact an HVAC expert to check the differential pressure, inverter PCB, and contact points. 

10. Daikin Mini Split Error Code E6

(Meaning – Compressor Overcurrent)

The error code E6 appears when the compressor motor exceeds its normal current load. That could happen due to a closed stop valve or a defective compressor or PCB. 

Fix 

Check if the stop valve is shut and open it. If that’s not the cause, replace the compressor; if that doesn’t work, replace the PCB. 

11. Daikin Mini Split Error Code E7

(Meaning – Outdoor Motor Fan Fault)

If there’s a problem with the outdoor motor fan, the error code E7 may pop up. That could happen due to a broken outdoor fan motor or an obstruction in the motor. That means you’ve to check out the outdoor fan. 

Fix 

Remove any obstruction around the outdoor fan motor; replace it if damaged. 

12. Daikin Mini Split Error Code F3

(Meaning – Discharge Pipe Thermistor Fault)

The error code F3 pops up on a Daikin Mini Split if there’s an issue with the discharge pipe thermistor. It could be due to a faulty discharge thermistor connector point or PCB. 

Fix 

Talk to an HVAC expert who can check the discharge thermistor, connector point, or printed circuit board. 

13. Daikin Mini Split Error Code F6

(Meaning – Abnormally High Pressure)

Your Daikin Mini Split will tell you when the pressure level rises beyond the acceptable limit. Once that’s the case, the error code F6 will pop up, and it could be due to a disconnected outdoor thermistor or refrigerant overcharging. 

Fix 

Check if there’s a disconnection on the outdoor thermistor and fix it. Call a pro to check the rest. 

14. Daikin Mini Split H6 Error Code

(Meaning – Position Detection Sensor Malfunction)

The error code H6 appears on a Daikin Mini Split when there’s a problem with the position detection sensor. That could happen due to a faulty compressor, outdoor PCB, or contact points. 

Fix 

Replace the compressor, outdoor printed circuit board, or contact points, depending on what’s faulty. 

15. Daikin Mini Split Error Code JA

(Meaning – High-Pressure Sensor Malfunction)

You can expect your Daikin Mini Split to display the error code JA when the high-pressure sensor malfunctions. It could be that the high-pressure sensor is defective or the connector points or PCB. 

Fix 

Replace the high-pressure sensor, connector points, or outdoor PCB, depending on what’s faulty. 

16. Daikin Mini Split Error Code J3

(Meaning – Discharge Pipe Thermistor Fault)

The error code J3 pops up on a Daikin air conditioner when there’s an issue with the discharge pipe thermistor. In such a case, the possible triggers include a faulty discharge pipe thermistor, connector points, or outdoor PCB. 

Fix 

Replace the discharge pipe thermistor, connector points, or outdoor PCB. 

17. Daikin Mini Split Error Code L5

(Meaning – Inverter Overcurrent)

The error code L5 appears to show an excessively loaded inverter. That happens if the compressor or inverter PCB is faulty. 

Fix 

Replace the compressor or inverter PCB, depending on what part is faulty. 

18.  Daikin Mini Split Error Codes U0

(Meaning – Refrigerant Shortage)

The error code UO appears when the refrigerant level drops, affecting the Mini Split’s ability to cool. Overall, its possible causes include:

• Refrigerant clogging 
• Faulty thermistor 
• Faulty low-pressure sensor 
• Defective outdoor PCB 

Fix 

Unfortunately, anything to do with inadequate refrigerant should be left to experts. So, call an HVAC pro in this case. 

19. Daikin Mini Split Error Code U3

(Meaning – Check Operation Error)

The error code U3 is a check operation error that pops up when the check operation fails. 

Fix  

Try resetting the Mini Split; call a pro if it doesn’t work. 

20. Daikin Mini Split Error Codes U4

(Meaning – Communication Malfunction)

Both the outdoor and indoor units have to be in sync. If there’s a miscommunication between them, the error code may pop up. Its cause could be any of these:

• The outdoor unit could be off 
• Possible wiring fault 
• Faulty indoor or outdoor PCB

Fix 

Ensure the outdoor unit is on, fix any loose/broken wires, and call a pro if you can’t fix it. 

Concluding Thought 

Now you have a quick troubleshooting guide for 20 Daikin Mini Split error codes. You can interpret the codes and fix the underlying issues using the guide. If the error code you seek is not in the above list, check it here. Do that before you involve Daikin or local HVAC experts.