Need the model number. It's an indoor liquid line thermistor. Are you sure it's bad? And not just loose? Could also be a board. Answer from Nerfixion on reddit.com
Scognito's blog
scognito.wordpress.com › 2021 › 07 › 10 › replacing-a-thermistor-from-air-conditioner-daikin-error-code-c4
Replacing a thermistor from air conditioner (DAIKIN error code C4) – Scognito's blog
July 10, 2021 - The error code in my case is C4 and indicates (according to the manual, or here) a malfunction of the liquid pipe thermistor. ... In a nutshell, a thermistor is like a digital thermometer.
Daikin
my.daikin.eu › content › dam › DASW › supportavdelningen › Felkoder_SM-TS3errorcode_chart.pdf pdf
Simple Self-Diagnosis by Malfunction Code After Sales Service Division (SM-TS3)
Simple Self-Diagnosis by Malfunction Code · After Sales Service Division
C4 error code on Daikin Minisplit - Unable to find the needed part
Need the model number. It's an indoor liquid line thermistor. Are you sure it's bad? And not just loose? Could also be a board. More on reddit.com
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August 19, 2022Daikin Altherma hybrid problem (error code 4)
How old is the unit? Has it been running fine for a few years until now? According the the installation model I found (on Google) for model EHYKOMB33AA Error Code 4 (No Flame Signal) Gas tap is closed No or incorrect ignition gap Gas supply pressure is too low or fails Gas valve or ignition unit is NOT powered I don't have one of these units. But on a normal, indoor natural gas furnace at least, this typically means that the flame sensor is dirty or has a poor connection. My furnace does this every few years. I remove the flame sensor (which is essentially a temperature probe that senses the heat of the flame when it ignites) clean it with some light sand paper, and then put it back. Being sure to plug/unplug the wiring harness multiple times to scrape off any oxidation on the contacts. See if you can watch it start up. Does the burner come on for a few seconds and then shutoff? That's a dead ringer for the flame sensor. Or, does the gas not ignite (the igniter will typically glow read hot or spark/click (piezo)? Or is the igniter good, but no gas is coming out? More on reddit.com
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November 21, 2024C4 22 error code in Samsung digital inverter AC - less than a month old model.
C4 22 - for me it looked to be a refrigerant charge issue. This is called the 'Refrigerant Flow Blocking Error'. Check piping, bends, crack, check for leaks, recharge with refrigerant. Also, online it talks about the expansion valve and PCB.. check for leaks, piping and recharge first More on reddit.com
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August 14, 2022plzz help, i m having a “C3 error on my diakin ac, can anyone plzz help me fix this or tell me what this problem is
check the condensate drain/pump system More on reddit.com
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June 2, 2024What does the Daikin AC Error Code C4 mean?
The Daikin AC Error Code C4 indicates a critical system interruption. Immediate diagnostic intervention is required.
atlasaircons.com
atlasaircons.com › fault-codes › daikin-ac-error-code-c4
🔴 Daikin AC Error Code C4 Fixed | Official Troubleshooting & ...
What does Error Code C4 mean on a Daikin AC?
Error Code C4 on a Daikin Air Conditioner indicates a 'Malfunction of Liquid Pipe Thermistor'. This sensor measures the temperature of the refrigerant entering the indoor coil. If it is Open (cut wire) or Short (damaged), the AC stops.
atlasaircons.com
atlasaircons.com › fault-codes › daikin-ac-error-code-c4
🔴 Daikin AC Error Code C4 Fixed | Official Troubleshooting & ...
How much does it cost to fix Daikin C4 error?
Fixing a C4 error typically involves replacing the thermistor assembly. Costs range from ₹850 to ₹1,400 depending on whether it's a single sensor or a dual-sensor harness.
atlasaircons.com
atlasaircons.com › fault-codes › daikin-ac-error-code-c4
🔴 Daikin AC Error Code C4 Fixed | Official Troubleshooting & ...
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Atlas Aircon
atlasaircons.com › fault-codes › daikin-ac-error-code-c4
🔴 Daikin AC Error Code C4 Fixed | Official Troubleshooting & Repair | Atlas Aircon
February 8, 2026 - Do not waste hours deciphering manuals. The Atlas Aircon engineering squad has successfully cleared the Daikin AC Error Code C4 across multiple industrial sites. We can dispatch a technician to your facility immediately.
Silverback Air-con
silverbackaircon.sg › home › aircon error code › daikin error code › daikin c4 error code: ultimate guide
Daikin C4 Error Code: Ultimate Guide - Silverback Air-con
October 27, 2025 - The Daikin C4 error code typically means a problem in the indoor thermistor. It is also possible that the indoor sensor coil is reading temperature fluctuations due to insufficient refrigerant gas present in the system. If it’s the latter problem, a gas top-up (with a minimum price of $50 ...
Beaconsaves
beaconsaves.com › blog › daikin-mini-split-c4-error-code
Daikin Mini Split C4 Error Code: What It Means & What to Check | Beacon Services & Appliances
March 6, 2026 - A: On many Daikin mini split systems, C4 means the indoor heat exchanger thermistor is reading abnormally. In plain language, the system may not be getting a reliable temperature reading from the indoor coil sensor.
Reddit
reddit.com › r/hvacadvice › c4 error code on daikin minisplit - unable to find the needed part
r/hvacadvice on Reddit: C4 error code on Daikin Minisplit - Unable to find the needed part
August 19, 2022 -
So my mom has a little cottage that has a Daikin minisplit. The unit isn't working and it gives the c4 error code... bad thermistor sensor?? Problem is, the place where I bought the unit is unable to get hold of the part needed. They keep saying "it's on the truck" and it's not arriving. My mom is miserable in this heat (florida). Is there anywhere I could order this part from? I'm not even sure what it's actually called!
Top answer 1 of 3
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Need the model number. It's an indoor liquid line thermistor. Are you sure it's bad? And not just loose? Could also be a board.
2 of 3
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You’ll need to call a tech for that one, could either be bad mother board for thermistor or EEV is on wrong frequency either way both parts need to be OEM and Daikin won’t sell to the consumer
Daikin India
daikinindia.com › product-services › product-services › error-codes
Error Codes | Daikin
The remote controller can receive relevant error codes from the indoor unit. The code indication changes as shown below, and notifies with a long beep. ... Customer Support Information: WhatsApp us your query @ 9871409300. Call Our Customer Contact Centre: 011-40319300 / 1860 180 3900 or Write To Us at customerservice@daikinindia.com X
Skycon Air Pty Ltd
skyconair.com.au › home › error codes › daikin error codes › c4
Daikin C4 Error Code
May 8, 2025 - If you see the C4 error code, it means there is a malfunction of the liquid pipe thermistor for the heat exchanger.
Airway Group
airway-group.co.uk › home › help & advice › daikin air conditioning fault codes explained [infographic]
Daikin Air Conditioning Fault Codes Explained [Infographic] | Airway
April 2, 2026 - C3 – Abnormal water level sensor resistance – The water level sensor has either disconnected, short circuited or developed a fault. C4 – Abnormal resistance level of indoor heat thermistor – This means the thermistor has either become ...
Coolchannels
coolchannels.com.sg › home › blogs › common daikin air conditioner fault codes and how to troubleshoot them
Troubleshooting Common Daikin Air Conditioner Fault Codes
February 7, 2026 - If your Daikin unit displays a C4 error, the issue lies in the thermistor (temperature sensor) that monitors the heat exchanger. When faulty, it can cause inaccurate temperature readings or inconsistent cooling.
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Daikin
daikin.com › products › ac › services › error_codes
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.
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 = C4 Error Code Definition = Malfunction of liquid pipe thermistor for heat exchanger. What To Fix/Check/Replace = Defective thermistor for liquid pipe. Defective indoor unit PCB.
Fixya
fixya.com › home › forum › heating & cooling › cfm › daikin r410a split system air conditioner
SOLVED: How too solve daikin error code c4 - Cfm Daikin R410a Split System... | Fixya
November 10, 2014 - Cfm Daikin R410a Split System... ... Clicking this will make more experts see the question and we will remind you when it gets answered. ... You can't post conmments that contain an email address. ... An expert who has achieved level 1. ... An expert that has 1 follower. ... An expert whose answer got voted for 2 times. ... An expert who has achieved level 1. ... An expert that has 1 follower. ... An expert whose answer got voted for 2 times. ... C4 error code has nothing to do with outdoor pcb.
Reddit
reddit.com › r/heatpumps › daikin altherma hybrid problem (error code 4)
r/heatpumps on Reddit: Daikin Altherma hybrid problem (error code 4)
November 21, 2024 -
Based on daikin EHYKOMB33AA instructions, the error code 4 means no gas.
I would have expected that the system would keep working on electricity only, but it completely stopped working. Is this normal or just my settings are not correct? Do we have technicians on this thread?
Top answer 1 of 2
2
How old is the unit? Has it been running fine for a few years until now? According the the installation model I found (on Google) for model EHYKOMB33AA Error Code 4 (No Flame Signal) Gas tap is closed No or incorrect ignition gap Gas supply pressure is too low or fails Gas valve or ignition unit is NOT powered I don't have one of these units. But on a normal, indoor natural gas furnace at least, this typically means that the flame sensor is dirty or has a poor connection. My furnace does this every few years. I remove the flame sensor (which is essentially a temperature probe that senses the heat of the flame when it ignites) clean it with some light sand paper, and then put it back. Being sure to plug/unplug the wiring harness multiple times to scrape off any oxidation on the contacts. See if you can watch it start up. Does the burner come on for a few seconds and then shutoff? That's a dead ringer for the flame sensor. Or, does the gas not ignite (the igniter will typically glow read hot or spark/click (piezo)? Or is the igniter good, but no gas is coming out?
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So che è di 3 mesi fa, ma rispondo ugualmente. Le ibride (Daikin) NON possono riscaldare l'acqua calda sanitaria (ACS) con la pompa di calore a meno di non avere anche il serbatoio d'acqua. Anche d'estate, coi pannelli fotovoltaici a pieno ritmo consumo gas per ACS. In più se accade un errore alla pompa di calore, la caldaia continuerà a funzionare in solo Gas. Viceversa si blocca tutto. Dogma di fede..
YouTube
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How to remove C4 error in daikin window ac - YouTube
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Published September 11, 2024
Daikin NZ
daikin.co.nz › blogs › knowledge-base › what-is-a-c4-fault
What is a C4 fault? – Daikin NZ
February 24, 2025 - Fault C4 is Heat exchanger thermistor system abnormality For more information open the Daikin Service App on your mobile. 1. Ensure you are logged into the Daikin Service App. You will see Engineer as below.
TechFaultFix
techfaultfix.com › home › heating & cooling (hvac) › air conditioners › daikin
Daikin Air Conditioners Error Codes & Troubleshooting
Daikin indoor unit shows A9; unit may not heat properly · Indoor EEPROM or Option Setting Error · C4 · Indoor unit stops; C4 error displayed; may be associated with coil temperature sensing · Indoor Heat Exchanger Thermistor Fault · C5 ...
CoolAutomation
coolautomation.com › blog › daikin error codes: comprehensive breakdown
Daikin Error Codes (Malfunction Self-Diagnosis)
July 20, 2025 - Following are some of the most common Daikin error codes and their presumed causes. Tired of wasting time with repeated on-site visits, finally diagnosing a problem, and then realizing you lack the necessary parts?
The Wrasse Gazette
wrasse.plymouth.ac.uk › home › ac news › daikin ac error codes: troubleshooting guide
Daikin AC Error Codes: Troubleshooting Guide — The Facts
January 5, 2026 - Common Daikin AC Error Codes and Their Solutions · Code A1: Faulty Indoor Unit PCB · Code A3: Drainage Problem · Code C4: Thermistor Malfunction · Code E1: Outdoor Unit PCB Problem · Code F3: Discharge Temperature Abnormality · Code H7: ...
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 - Full Daikin Error Codes Table · ... Motor Error · A9 - Expansion Valve Error · C-Codes: Sensor Errors · C4 - Heat Exchanger Sensor Error ·...
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