I have same error, did you fix the issue? (only on heat mode) Answer from t0lkman1421 on reddit.com
Silverback Air-con
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Daikin E3 Error Code (An Ultimate Guide) - Silverback Air-con
February 23, 2024 - For Daikin E3 error code, you will most likely require the thermistor or Printed Circuit Board (PCB) to repair this particular problem. So if you identify this issue via your Aircon technician, you will have to ask them to give you the condenser unit model number.
Errors Codes
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Solve the E3 error on your Daikin air conditioner
May 8, 2024 - Check your Daikin air conditioner filter to ensure it is clean and in good condition: Open the air conditioner cover and locate the filter, carefully remove it, and proceed to maintain it.
CNC Machining | Daikin Spindle Chiller Error Code E3 | Practical Machinist - Largest Manufacturing Technology Forum
Intermittently getting error code "E3" on a Daikin spindle chiller that came with our DMG Mori HMC. The machine is 8 years old. Daikin's website describes the error code: Dirty outdoor unit heat exchanger Shortage of water volume Clogged refrigerant piping Defective connector contact Defective HPS · Click to expand... Spindle oil (Mobil Velocite No 3) was changed awhile back. It fixed ... More on practicalmachinist.com
Code e3-01 on Daikin VRF unit
Having an issue with a Daikin VRF unit model# RXYQ120PBTJ. There is no operation from the unit, and the indoor thermostat is displaying an error code of E3-01. More on forum.heatinghelp.com
Daikin E3 Error Nightmare
I have same error, did you fix the issue? (only on heat mode) More on reddit.com
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September 9, 2023My Daikin brc1d52 constantly shows E3 error and shutdown, technician says i have to turn it off completely for 24h, so the auto-test resets, is it true ?
Looking it up the E3 code seems to be high pressure so that wouldn't even make sense if you were leaking refrigerant your outdoor coil Maybe dirty your fan could be dropping out but either way I don't think turning it off for 24 hours is going to make a difference More on reddit.com
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Reddit
reddit.com › r/hvacadvice › daikin e3 error nightmare
r/hvacadvice on Reddit: Daikin E3 Error Nightmare
September 9, 2023 -
Ducted under floor residential system, 8 zone controller and 11 outlets. We have been having an E3 error for nearly a year: “E3: Fault Code E3: Actuation of high pressure switch (HPS).”
The installation company has been very responsive, but have not fixed the issue even though they have replaced almost everything:
-control board -intake duct -high pressure switch -high pressure sensor -second intake was added to a different part of the house -completely drained and replaced refrigerant multiple times
The only common cause is when we have a cold night, not necessarily freezing cold but below 40 F / 5c. Doesn’t seem to happen as frequently on mild nights.
Has anyone experienced something like this? What would be left to even replace? I am equally annoyed and curious to know what is actually causing it!
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I have same error, did you fix the issue? (only on heat mode)
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Airflow before charge... Sizing of system(s) involved would be a helpful detail, as well as exact airflows of each zone, etc... (What I'm getting at is, you need a different contractor who will actually determine if the zone sizes are compatible with the unit sizes) High pressure faults are rarely because of high pressure switches, sensors, or circuit boards...
ACLogics
aclogics.com › hvac-diagnostics › daikin › e3-packaged
Daikin Error Code E3: Troubleshooting & Fixes - ACLogics
Verify airflow first, then confirm operating pressures and temperature relationship before adjusting charge. Look for restrictions, iced coils, or dirty heat-transfer surfaces that can mimic a charge problem.
Daikin
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Simple Self-Diagnosis by Malfunction Code After Sales Service Division (SM-TS3)
Simple Self-Diagnosis by Malfunction Code · After Sales Service Division
JustAnswer
justanswer.com › hvac › rneh5-e3-error-code-daikin-unit-ap12891-year-filters.html
E3 Error Code on Daikin Unit? Reset Pump Help & Guide
AP12891 units often face E3 errors from dirty filters and pump reset issues after maintenance. After cleaning the filters on your Daikin AP12891, reset the pump by turning off the unit’s power for 5 minutes. This allows the system to clear error codes. The E3 error typically indicates a water pump or drainage issue caused by clogged filters restricting flow.
ACLogics
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Daikin Error Code E3 — Dirty outdoor unit heat exchanger | Fix Guide
How to fix Daikin Split/ Multi Split error code E3. Diagnosis: Actuation of high pressure switch (HPS). Causes: Dirty outdoor unit heat exchanger Defective high pressure switch Clogged refrigerant piping Defective connector contact.
RemoveandReplace.com
removeandreplace.com › home › home air conditioning › daikin air conditioner ac error codes
DAIKIN Air Conditioner AC Error Codes
December 22, 2022 - Daikin AC Error Code = E3 Error Code Definition = Dirty outdoor unit heat exchanger What To Fix/Check/Replace = Actuation of high pressure switch – Shortage of water volume – Clogged refrigerant piping – Defective connector contact – Defective HPS
TechFaultFix
techfaultfix.com › home › heating & cooling (hvac) › air conditioners › daikin › e3
Daikin Air Conditioner - Error E3 - High-Pressure Protection
March 27, 2026 - Learn how to fix Daikin error code E3. Daikin system stops with E3; this may occur during cooling or heating under heavy load.. See common causes and step-by-step DIY repair instructions.
JustAnswer
justanswer.com › hvac › qia9p-repair-strategies-hope-hvac.html
Fixing Daikin Mini-Split: E3 Error to Non-Functional Q&A
Check the indoor unit’s temperature ... overheating or electrical issues. A junior technician should verify refrigerant levels, clean filters, and reset error codes....
JustAnswer
justanswer.com › uk-appliance › 7bs3w-daikin-units-showing-e3-error-code-high-pressure-switch-activated.html
How to Reset and Fix Daikin E3 Error Code | Expert Q&A
The E3 error on Daikin units indicates the high pressure switch has activated due to excessive refrigerant pressure. First, turn off the unit and check for blocked condenser coils or dirty filters restricting airflow. Inspect the outdoor fan ...
Daikin
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Error Codes | After Sales Service | Air Conditioning and Refrigeration | Daikin Global
Error Code Search offers information on the cause of the malfunction and the status of your air conditioner by entering the error code. Error Code Search List of Error Codes(0.1MB) Please refer to "How to Check Error Codes" for step-by-step instruction to check the error codes.
Practical Machinist
practicalmachinist.com › forums › manufacturing today › cnc machining
CNC Machining | Daikin Spindle Chiller Error Code E3 | Practical Machinist - Largest Manufacturing Technology Forum
May 9, 2024 - Daikin's website describes the error code: Dirty outdoor unit heat exchanger Shortage of water volume Clogged refrigerant piping Defective connector contact Defective HPS · Click to expand... Spindle oil (Mobil Velocite No 3) was changed awhile back. It fixed ...
ErrBase
errbase.com › home › daikin › minisplit › e3 error
Daikin Mini-Split E3 Error Code: High Pressure Protection | ErrBase
Fix a Daikin E3 high pressure error with these pro tips. I explain how to clean your coils, check for overcharge, and reset the safety switch safely.
Heating Help
forum.heatinghelp.com › a-c, heat pumps & refrigeration
Code e3-01 on Daikin VRF unit — Heating Help: The Wall
May 27, 2022 - It turned out to be the inverter compressor was grounded. I went back today with a megger, and didnt need it because the compressor was grounded so bad a standard meter could pick it up. Strange that the same code could be a refrigerant, or electric issue
CoolAutomation
coolautomation.com › blog › daikin error codes: comprehensive breakdown
Daikin Error Codes (Malfunction Self-Diagnosis)
July 20, 2025 - Easily identify Daikin HVAC system faults with this complete list for simple self-diagnosis & troubleshooting. Includes VRV, SkyAir, HRV systems, and more.
JustAnswer
justanswer.com › hvac › n7npr-heating-mode-heating-mode-not-working-u4-e3-error.html
Heating Mode Not Working? U4 & E3 Error Code Fix Guide
Error codes U4 and E3 typically signal a faulty temperature sensor or communication error between the thermostat and HVAC control board. First, reset the system by powering it off for 5 minutes. Inspect and clean the temperature sensors and ...
Skycon Air Pty Ltd
skyconair.com.au › home › error codes › daikin error codes › e3
Daikin E3 Error Code
May 8, 2025 - The E3 error code indicates that the high-pressure sensor (HPS) has been triggered.
Fixurge LLC
fixurge.com › home › daikin › daikin error codes: full list and how to fix them
Daikin Error Codes Guide: Full List + Troubleshooting (2026)
April 22, 2026 - Complete Daikin error code list with clear meanings, causes, and fixes. Diagnose your AC step by step and know when to call HVAC repair.
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