I have same error, did you fix the issue? (only on heat mode) Answer from t0lkman1421 on reddit.com
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!
Top answer 1 of 4
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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...
Silverback Air-con
silverbackaircon.sg › home › aircon error code › daikin error code › daikin e3 error code (an ultimate guide)
Daikin E3 Error Code (An Ultimate Guide) - Silverback Air-con
February 23, 2024 - The Daikin E3 error code typically indicates either a high pressure switch or sensor defect or an instantaneous power failure. In both cases, clearing the E3 error entails replacing a malfunctioning PCB or thermistor, whichever is ultimately found to be the cause of the error.
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: System No.1 Actuation of high pressure switch (HPS) Dirty outdoor unit heat exchanger Shortage of water volume Clogged... 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
My 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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August 22, 2023Daikin E3 Error Nightmare
I have same error, did you fix the issue? (only on heat mode) More on reddit.com
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Daikin Error Code E3: Troubleshooting & Fixes - ACLogics
How to fix Daikin Packaged 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.
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skyconair.com.au › home › error codes › daikin error codes › e3
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May 8, 2025 - The E3 error code indicates that the high-pressure sensor (HPS) has been triggered.
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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 this exact issue previously but ...
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airway-group.co.uk › home › help & advice › daikin air conditioning fault codes explained [infographic]
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April 2, 2026 - E3 – High pressure is too high (HPS activation) – The condenser may have short circuited or overloaded, or the heat exchanger may be dirty.
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RemoveandReplace.com
removeandreplace.com › home › home air conditioning › daikin air conditioner ac error codes
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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 – ...
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Daikin NZ
daikin.co.nz › blogs › knowledge-base › what-is-a-e3-fault
What is a E3 fault? – Daikin NZ
February 24, 2025 - Fault E3 is Abnormal high pressure (detected by high pressure switch) For more information open the Daikin Service App on your mobile. 1. Ensure you are logged into the Daikin Service App.