Troubleshoot the eight most common Daikin air conditioner issues
Over time any appliance that is being used regularly will eventually have small issues – regardless of how high of quality the construction or parts behind it are.
It can be a huge headache having an air conditioner that’s not working correctly – especially on a hot summer’s day.
Below are the eight most common issues that occur with Daikin units, as well as advice about what to do when these problems arise.
Guide to Fixing Problems with your Daikin Air-Con:
Daikin AC unit not turning on
In general, air conditioning systems use quite a lot of power to operate at their full potential. Because of this, one of the most common reasons a Daikin air conditioning unit won’t turn on is a blown or tripped circuit breaker.
To check if this is the issue, have a look in your switchboard to see if any of the switches have tripped. If the circuit breaker is tripped, you can reset same but if it trips again, ensure that you call an air conditioning technician immediately and don’t use your system until it’s fixed.
If the system is not tripping the circuit breaker but still will not turn on or cool then you can try a ‘hard’ reset to see if this solves the problem with your air conditioner. You can do this by going to the outdoor unit and turning the isolator off and leaving it off for at least 30 minutes. You can then turn the isolator on and see if the air conditioner has reset itself and returned to normal operation. If this does not work you will need to consult a licenced air conditioning technician to carry out diagnosis and repair of your air conditioner.
Daikin AC not cooling
If you have found that your air conditioner isn’t sending out cold air, you should first check check to ensure that you don’t have dirty air filters. Air conditioner filters should be cleaned every 3-4 months or sooner in some instances. If they aren’t, they will accumulate dust and debris. A clogged air filter can block air flow and prevent your air conditioner working.
Some Daikin systems have an ‘auto filter cleaning setting’. However, remember that an AC unit may not turn on immediately after a filter cleaning operation.
Lastly, double-check the temperature and mode setting on your Daikin remote (controller) and ensure it’s correct.
A regular air conditioning service will ensure that you shouldn’t ever have a dirty or clogged air filter. A regular air conditioner service can also detect any issues and prevent them from becoming a major problem which cause breakdowns.
Daikin AC is leaking
A very small amount of condensation is often normal for your Daikin air conditioner. However, if it becomes more than a few droplets on the vents on a ducted air conditioner or coming from the indoor unit in the case of a split system, it’s an indication of a problem. Turn the unit off and contact a professional to avoid further damage to the air conditioner and water damage to walls etc.
Daikin AC is flashing and error code
Daikin air conditioners are equipped with a green operation lamp (green light) and an orange operation lamp (orange light) to make users aware of certain issues.
When a green light is shown on a Daikin unit, there are a number of problems it can be connected to. To find out exactly what the issue is, remove the back cover of the remote and locate the cancel button. Hold the cancel button for 5-10 seconds until the temperature on the screen is replaced by two flashing zeros.
Keep pressing the cancel button until you hear a long beep. After this, the zeros on the screen will be replaced by numbers that indicate specific issues.
The air conditioner will beep once if the number showing on the remote is not the correct issue. If the Daikin beeps twice, one of the two numbers showing up on the remote is the correct issue. If the unit gives off a long continuous beep, both numbers on the remote indicate the correct issue, and this is your problem.
Once the correct numbers are found, please search the Daikin air conditioner fault code page found online to troubleshoot the issue.
Daikin Air Con Remote Isn’t Working
When the Daikin air conditioner remote isn’t working, you can try to reset the remote. This can be done by holding the on/off button on the remote controller for two seconds. Next, press the on/off switch once to stop the operation and a second time to restart the remote.
If your remote controller is not showing anything on the display or is faded, try to replace the batteries and then reset the remote controller as written about above.
If neither of these work, contact a professional for further help.
Daikin AC is too loud
If your Daikin air conditioner unit is making any sounds that are out of the ordinary you should turn off the air conditioner and get a service technician to attend.
Daikin AC smells bad
If your Daikin is emitting an unpleasant smell, ensure that the filter has been changed recently. There are various reasons why an AC might smell badly, ranging from a dead insect inside your unit to a mechanical issue. For more causes and fixes for a bad-smelling AC, you can check out our guide here.
Often when an air conditioner has a bad smell – a deep clean is needed – in addition to the standard service.
Daikin AC is not turning off
If a Daikin air conditioner isn’t turning off, it could be linked to a dirty filter that doesn’t let the room reach the desired temperature, a wrong setting or a power failure. You should first check that the dry cooling, dehumidifier, cooling and mould proof settings are all off.
These settings could cause the system to continuously run. There’s a range of reasons that your system may not be turning off, and most are linked to it not reaching the right temperature. For more causes and fixes for a Daikin AC that won’t turn off, you can check out our guide here.
Daikin Air conditioner Fault codes
Fault codes – A to C
|
Fault code |
Fault explanation |
Possible causes |
Origin of fault |
|
A0 |
External protection device activated |
External protection device connected to the terminal strip T1-T2 of indoor unit is activated |
Indoor unit |
|
A1 |
Malfunction of indoor unit PCB |
Defective indoor unit OCB. |
Indoor unit |
|
A3 |
Drain Level Control System Abnormality |
Drain clogging, upward slope, etc. Defective drain pump Defective float switch or short circuit connector |
Indoor unit |
| A4 | Malfunction of freezing protection |
Shortage of water volume Low water temperature setting Defective water temperature thermistor |
Indoor unit |
|
A5 |
High pressure control in heating, freeze-up protection control in cooling |
Clogged air filter of indoor unit and short circuit Defect of indoor unit heat exchanger thermistor |
Indoor Unit |
|
A6 |
Malfunction of fan motor |
Broken wires in, short circuit of, or disconnection of connectors from the fan motor harness Defective fan motor Defective indoor unit PCB |
Indoor unit |
|
A7 |
Malfunction of swing flap motor |
Defective swing flap motor Defective indoor unit PCB Defective connection cable Defective airflow direction adjusting flap-cam |
Indoor unit |
|
A8 |
Malfunction of power supply or AC input overcurrent |
Defective power supply voltage Defective connection on signal line Defective wiring |
Indoor unit |
|
A9 |
Malfunction of electronic expansion valve |
Defective electronic expansion valve coil Defective indoor unit PCB Defective relay cables |
Indoor unit |
|
AA |
Heater overheat |
26WH is activated |
Indoor unit |
|
AF |
Malfunction of a humidifier system |
Humidifier unit (optional accessory) leaking Defective drain piping (upward slope, etc.) Defective indoor unit PCB |
Indoor Unit |
|
AH |
Malfunction of dust collector of air cleaner |
Defect of dust collecting element Stained insulator part Defect of high voltage power supply unit Defect of indoor unit PCB |
Indoor Unit |
|
AJ |
Malfunction of capacity setting (Indoor unit PCB) |
The capacity setting adaptor was not installed when replacing PCB. Defective indoor unit PCB |
Indoor unit |
|
C1 |
Failure of transmission (between indoor unit PCB and sub PCB) |
Defective connection of the connector between indoor unit PCB |
Indoor unit |
|
C4 |
Malfunction of liquid pipe thermistor for heat exchanger |
Defective thermistor for liquid pipe Defective indoor unit PCB Defective connector contac |
Indoor unit |
|
C5 |
Malfunction of gas pipe thermistor for heat exchanger |
Defective thermistor for gas pipe Defective indoor unit PCB Defective connector contact |
Indoor unit |
|
C6 |
Malfunction of fan motor sensor or fan control driver |
Defective fan PCB Defective connection of capacity setting adaptor Field setting error |
Indoor unit |
|
C7 |
Front panel driving motor fault |
Defective front panel driving motor Defective limit switch |
Indoor unit |
|
C9 |
Malfunction of suction air thermistor |
Defective thermistor for suction air Defective indoor unit PCB Defective connector contact |
Indoor unit |
|
CA |
Malfunction of discharge air thermistor |
Defective thermistor for discharge air Defective indoor unit PCB Defective connector contact |
Indoor unit |
|
CC |
Malfunction of humidity sensor system |
Defective humidity sensor Defective connector contact |
Indoor unit |
|
CJ |
Room temperature thermistor in remote controller abnormality |
Defective room temperature thermistor in remote controller Defective remote controller PCB External factor (Noise etc.) |
Indoor unit |
Fault codes – E to H
|
Fault code |
Fault explanation |
Possible causes |
Origin of fault |
|
E0 |
Protection devices activated (unified) |
Protection device connected to outdoor unit PCB actuated Defective protection device connector contact |
Outdoor unit |
|
E1 |
Protection devices activated (unified) |
Defective outdoor unit PCB Defective connection of inside/ outside relay wires |
Outdoor unit |
|
E3 |
Actuation of high pressure switch (HPS) |
Dirty outdoor unit heat exchanger Defective high pressure switch Clogged refrigerant piping Defective connector contact |
Outdoor unit |
|
E3 |
System No.1 Actuation of high pressure switch (HPS) |
Dirty outdoor unit heat exchanger Shortage of water volume Clogged refrigerant piping Defective connector contact Defective HPS |
Outdoor unit |
|
E4 |
Actuation of low pressure switch (LPS) |
Abnormal drop in low pressure Defective low pressure sensor Defective outdoor unit PCB Defective connector contact |
Outdoor unit |
|
E5 |
Inverter compressor motor or overheat |
Inverter compressor lock High differential pressure Defective inverter PCB UVW connection error Defective connector contact |
Outdoor unit |
|
E6 |
STD compressor motor overcurrent/lock |
Defective compressor Defective control PCB The stop valve is not opened |
Outdoor unit |
| E6 | System No.1 Compressor overcurrent |
Defective electronic expansion valve Shortage of refrigerant amount Defective compressor |
Outdoor unit |
|
E7 |
Malfunction of outdoor unit fan motor system |
Fan motor failure Neglect to connect or defective connection of harness/ connector between the fan motor and the PCB Fan does not rotate due to foreign matters caught in it |
Outdoor unit |
|
E8 |
Overcurrent of inverter compressor |
Defective compressor Defective inverter main circuit capacitor Defect of outdoor unit PCB Defect of power transistor |
Outdoor unit |
|
E9 |
Malfunction of electronic expansion valve coil |
Disconnection of connectors from electronic expansion valves |
Outdoor unit |
|
EA |
Malfunction of four way valve or cool/heat switch |
Defective four way valve Shortage of gas Defective outdoor unit PCB Defective thermistor |
Outdoor unit |
|
EC |
Malfunction of entering water temperature |
Cooling water temperature abnormality Defective outdoor unit PCB Defective thermistor |
Outdoor unit |
|
F3 |
Malfunction of discharge pipe temperature |
Defective discharge pipe thermistor Abnormal discharge pipe temperature Defective outdoor unit control PCB Defective connector contact |
Outdoor unit |
|
F6 |
Abnormal high pressure or refrigerant overcharged |
Refrigerant overcharged Disconnection of heat exchanger deicer thermistor Disconnection of outdoor air thermistor Disconnection of liquid pipe temperature thermistor Defective outdoor unit PCB |
Outdoor unit |
|
H0 |
Malfunction of sensor system of compressor |
Harness is disconnected, or defective connection Defective PCB |
Outdoor unit |
|
H1 |
Malfunction of room temperature sensor or humidifier unit damper |
Defective limit switch Defective damper |
Outdoor unit |
|
H3 |
Malfunction of high pressure switch (HPS) |
Defective high pressure switch Broken wire Defective outdoor unit PCB |
Outdoor unit |
|
H4 |
Malfunction of low pressure switch (LPS) |
Defective low pressure switch Broken wire Defective outdoor unit PCB Defective connector contact |
Outdoor unit |
|
H4 |
Malfunction of low pressure switch (LPS) |
Defective low pressure switch Broken wire Defective outdoor unit PCB Defective connector contact |
Outdoor unit |
|
H5 |
Malfunction of compressor motor overload thermistor |
Defect of compressor motor overload thermistor Defective connector contact |
Outdoor unit |
|
H6 |
Malfunction of position detection sensor |
Faulty contact of compress or cable Defective Defective outdoor unit PCB |
Outdoor unit |
|
H7 |
Malfunction of outdoor unit fan motor signal |
Abnormal signal from fan motor (Circuit failure) Disconnection/Short circuit in fan motor leads or disconnection of connector Defective inverter PCB |
Outdoor unit |
|
H8 |
Malfunction of compressor input (CT) system |
Defective power transistor Defective reactor Faulty wiring of inverter system Defective outdoor unit PCB |
Outdoor unit |
|
H9 |
Malfunction of outdoor air thermistor |
Defective connection of thermistor Defective outdoor unit PCB Defective outdoor air thermistor |
Outdoor unit |
|
HC |
Malfunction of (hot) water temperature thermistor |
Defective connection of thermistor Defective outdoor unit PCB Defective water temperature thermistor |
Outdoor unit |
|
HF |
Alarm in thermal storage unit or storage controller |
Thermal storage group defective wiring Defective setting Excess of thermal storage tank numbers |
Outdoor unit |
|
HJ |
Malfunction of thermal storage tank water level |
Low water level Defective switch setting Water level detecting sensor failure Defective connector contact |
Outdoor unit |
Fault codes – J to M
|
Fault code |
Fault explanation |
Possible causes |
Origin of fault |
|
J1 |
Malfunction of pressure sensor |
Defective pressure sensor connector contact Defective pressure sensor Defective outdoor unit PCB |
Outdoor unit |
|
J2 |
Malfunction of current sensor of compressor |
Defective current sensor Defective compressor Defective outdoor unit PCB |
Outdoor unit |
|
J3 |
Malfunction of discharge pipe thermistor |
Defective connection of thermistor Defective discharge pipe thermistor Defective outdoor unit PCB |
Outdoor unit |
|
J4 |
Malfunction of low pressure equivalent saturated temperature sensor system |
Defective connection of thermistor Defective thermistor Defective outdoor unit PCB |
Outdoor unit |
|
J5 |
Malfunction of suction pipe thermistor |
Defective connection of thermistor Defective suction pipe thermistor Defective outdoor unit PCB |
Outdoor unit |
|
J6 |
Malfunction of heat exchanger thermistor |
Defective connection of thermistor Defective heat exchanger thermistor Defective outdoor unit PCB |
Outdoor unit |
|
J7 |
Malfunction of thermistor (Refrigerant circuit) |
Defective connection of thermistor Defective liquid pipe thermistor Defective outdoor unit PCB |
Outdoor unit |
|
J8 |
Malfunction of thermistor (Refrigerant circuit) |
Defective connection of thermistor Defective liquid pipe thermistor Defective outdoor unit PCB |
Outdoor unit |
|
J9 |
Malfunction of thermistor (Refrigerant circuit) |
Defective connection of thermistor Defective gas pipe thermistor Defective outdoor unit PCB |
Outdoor unit |
|
JA |
Malfunction of high pressure sensor |
Defective connector contact Connection of low pressure sensor in mistake for high pressure sensor Defective high pressure sensor Defective outdoor unit PCB |
Outdoor unit |
|
JC |
Malfunction of low pressure sensor |
Defective connector contact Connection of high pressure sensor in mistake for low pressure sensor Defective low pressure sensor Defective outdoor unit PCB |
Outdoor unit |
|
JE |
Malfunction of oil pressure sensor or sub-tank thermistor |
Defective connector contact Defective sub-tank thermistor Defective outdoor unit PCB |
Outdoor unit |
|
JF |
Malfunction of oil level sensor or heating heat exchanger thermistor |
Defective connector contact Defective heat exchanger thermistor Defective outdoor unit PCB |
Outdoor unit |
|
L0 |
Malfunction of inverter system |
Shortage of power supply capacity Defective power transistor Defective outdoor unit PCB |
Outdoor unit |
|
L1 |
Malfunction of inverter PCB |
Defective compressor wiring Defective outdoor unit fan motor Blown fuse Defective inverter PCB |
Outdoor unit |
|
L3 |
El.compo. box temperature rise |
Fin temperature rise due to short circuit Defective outdoor unit fan motor Defective power transistor Defective outdoor unit PCB |
Outdoor unit |
|
L4 |
Malfunction of inverter radiation fin temperature rise |
Fin temperature rise due to short circuit Defective fin thermistor |
Outdoor unit |
|
L5 |
Inverter instantaneous overcurrent (DC output) |
Defective compressor coil (such as wiring disconnection or insulation failure) Compressor startup failure (mechanical lock) Defective inverter PCB |
Outdoor unit |
|
L6 |
Inverter instantaneous overcurrent (AC output) |
Overcharge of refrigerant amount Shortage of power supply capacity Defective compressor Defective inverter unit |
Outdoor unit |
|
L8 |
Malfunction of overcurrent inverter compressor |
Compressor overloaded Wiring disconnection in compressor coil Disconnection of compressor wiring Defective inverter PCB |
Outdoor unit |
|
L9 |
Malfunction of inverter compressor startup error (Stall prevention) |
The stop valve is not opened Defective compressor Error in wire connections to compressor Large differential pressure before compressor startup Defective inverter PCB |
Outdoor unit |
|
LA |
Malfunction of power transistor |
Defective power transistor Defective compressor Defective inverter PCB |
Outdoor unit |
|
LC |
Malfunction of transmission between control and inverter PCB |
Defective connection between the inverter PCB and the control PCB External factors (e.g. noise) Defective inverter compressor Defective control PCB (transmission block) |
Outdoor unit |
|
M1 |
Malfunction of central remote controller PCB |
Defective central remote controller PCB |
Outdoor unit |
|
M8 |
Malfunction of transmission between optional controllers for centralised control |
Other centralised control power disconnection Centralised control reset switch ON Defective transmission wiring Central remote controller address change |
Outdoor unit |
|
MA |
Improper combination of optional controllers for centralised control |
Improper combination of optional controllers for centralised control More than one master controller is connected Faulty setting of centralised control Defect of centralised control |
Outdoor unit |
|
MC |
Address duplication, improper setting |
Address duplication of central remote controller |
Outdoor unit |
Fault codes – P to U
|
Fault code |
Fault explanation |
Possible causes |
Origin of fault |
|
P0 |
Shortage of refrigerant amount (thermal storage unit) |
Shortage of refrigerant Clogged refrigerant piping |
Outdoor unit |
|
P1 |
Power voltage imbalance or inverter PCB |
Open phase Interphase voltage imbalance Defective capacitor in the main circuit Defective wiring in the main circuit Defective inverter PCB |
Outdoor unit |
|
P2 |
Automatic refrigerant charge operation stop |
The stop valve is not opened Closed valve of refrigerant tank |
Outdoor unit |
|
P3 |
Malfunction of thermistor in switch box |
Defective connection of thermistor Defective reactor thermistor Defective inverter PCB |
Outdoor unit |
|
P4 |
Malfunction of radiation fin temperature sensor |
Defective radiation fi n temperature thermistor Defective inverter PCB Defective INV. compressor Defective fan motor |
Outdoor unit |
|
P8 |
Heat exchanger freezing protection during automatic refrigerant charging |
(Close the refrigerant cylinder. Start again from step 1.) |
Outdoor unit |
|
P9 |
Malfunction of fan motor (humidifier unit) |
Defective fan motor Defective outdoor unit PCB Broken relay harness Defective connector contact |
Outdoor unit |
|
PA |
Refrigerant cylinder during automatic refrigerant charging |
Refrigerant cylinder of master unit is empty |
Outdoor unit |
|
PA |
Broken wire of heater (humidifier unit) |
Defective heater unit Defective thermistor Defective outdoor unit PCB |
Outdoor unit |
|
PC |
Refrigerant cylinder during automatic refrigerant charging |
Refrigerant cylinder of slave unit 2 is empty |
Outdoor unit |
|
PH |
Automatic refrigerant charge operation nearly completed |
Defective heater unit Defective connector contact Defective thermistor Defective outdoor unit PCB |
Outdoor unit |
|
PJ |
Malfunction of capacity setting (Outdoor unit PCB) |
Capacity setting adaptor is not installed Improper capacity setting adaptor Defective outdoor unit PCB |
Outdoor unit |
|
PJ |
Improper combination between inverter and fan driver |
Mis-matching of type of PCB Improper (or no) field setting after replacing outdoor unit main PCB |
Outdoor unit |
|
U0 |
Shortage of refrigerant |
Refrigerant shortage and refrigerant clogging (wrong piping) Defective thermistor Defective low pressure sensor Defective outdoor unit main PCB |
System |
|
U1 |
Reverse phase, open phase |
Power supply reverse phase T phase open phase Defective outdoor unit PCB (A1P) |
System |
|
U2 |
Malfunction of power supply or instantaneous power failure |
Abnormal power supply voltage Instantaneous power failure Defective main circuit wiring |
System |
|
U3 |
Check operation not executed or transmission error |
Check operation is not executed. |
System |
|
U4 |
Malfunction of transmission between indoor and outdoor unit |
Short circuit in indoor-outdoor or outdoor-outdoor transmission wiring (F1 / F2), or wrong wiring Outdoor unit power supply is OFF System address does not match Defective indoor unit PCB Defective outdoor unit PCB |
System |
|
U5 |
Malfunction of transmission between indoor unit and remote controller |
Transmission error between indoor unit and remote controller Connection of 2 main remote controllers (when using 2 remote controllers) Defective indoor unit PCB Defective remote controller PCB Transmission error caused by noise |
System |
|
U6 |
Malfunction of transmission between indoor units |
Faulty wiring External factor (Noise etc.) Defective indoor unit PCB |
System |
|
U7 |
Malfunction of transmission between outdoor units or outdoor storage unit |
Connection error of transmission wirings between outdoor unit and external control adaptor for outdoor unit Connection error of transmission wirings between outdoor units Defective outdoor unit PCB |
System |
|
U8 |
Malfunction of transmission between remote controllers |
Transmission error between main and sub remote controller Connection between sub remote controllers Defective remote controller PCB |
System |
|
U9 |
Malfunction of transmission (other system) |
Transmission error between other indoor and outdoor units Defective electronic expansion valve of other indoor unit Defective indoor unit PCB of other indoor unit |
System |
Fault codes – U to 7C
|
Fault code |
Fault explanation |
Possible causes |
Origin of fault |
|
UA |
Defect of indoor/outdoor power supply |
Wrong model connections Improper power supply Wrong PCB connected Defective PCB |
System |
|
UA |
Improper combination of indoor and outdoor units |
Excess of connected indoor units Defective outdoor unit PCB Mismatch of the refrigerant type of indoor and outdoor unit Setting of outdoor unit PCB was not carried out after replacing to spare PCB |
System |
|
UA |
Remote temperature setting wire disconnection |
Remote temperature setting wire disconnection Defective connector contact |
System |
|
UC |
Malfunction of setting of centralised control equipment address |
Address duplication of centralised control equipment Defective indoor unit PCB |
System |
|
UE |
Malfunction of transmission between indoor unit and centralised control equipment |
Transmission error between optional controllers for centralised control equipment and indoor unit Connector for setting main controller is disconnected.(or disconnection of connector for independent / combined use changeover switch.) Defective PCB for central remote controller Defective indoor unit PCB |
System |
|
UF |
System is not set yet |
Improper connection of transmission wiring between indoor-outdoor units and outdoor-outdoor units Failure to execute check operation Defective indoor unit PCB Stop valve is not opened |
System |
|
UH |
Malfunction of system |
Improper connection of transmission wiring between indoor-outdoor units and outdoor-outdoor units Defective indoor unit PCB Defective outdoor unit PCB |
System |
|
UJ |
Malfunction of transmission (accessory device) |
Defect of accessory devices Faulty wiring |
System |
|
60 |
External protection device activated (Heat reclaim ventilator) |
Actuation of external protection device Defective output signal wiring Defective control PCB |
Other |
|
64 |
Malfunction of indoor air thermistor (Heat reclaim ventilator) |
Defective connector contact Defective indoor air thermistor Defective control PCB |
|
|
65 |
Malfunction of outdoor air thermistor (Heat reclaim ventilator) |
Defective connector contact Defective outdoor air thermistor Defective control PCB |
|
|
6A |
Malfunction of damper system (Heat reclaim ventilator) |
Defective connector contact Defective limit switch Defective damper motor |
|
|
70 |
System No. 2 Compressor overheat |
Shortage of refrigerant amount Defective connector contact Leakage of four way valve |
|
|
71 |
System No. 2 Compressor overcurrent |
Shortage of refrigerant amount Short circuit Defective |
|
|
72 |
System No. 2 Compressor overcurrent |
Defective fan motor connector contact Defective fan motor Defective PCB |
|
|
73 |
System No. 2 Actuation of high pressure switch (HPS) |
Dirty heat exchanger Shortage of water volume Clogged refrigerant piping Defective connector contact Defective HPS |
|
|
74 |
System No. 2 Actuation of low pressure switch (LPS) |
Clogged refrigerant piping Defective connector contact Shortage of gas Defective LPS |
|
|
75 |
System No. 2 Malfunction of low pressure sensor |
Defective connector contact Defective low pressure sensor Defective PCB |
|
|
76 |
System No. 2 Malfunction of high pressure sensor |
Defective connector contact Defective high pressure sensor Defective PCB |
|
|
77 |
System No. 1 Malfunction of fan inter lock |
Defective relay contact Broken wire |
|
|
78 |
System No. 2 Malfunction of fan inter lock |
Defective relay contact Broken wire |
|
|
7A |
System No. 2 Malfunction of compressor current sensor |
Defective current sensor Defective compressor Defective outdoor unit PCB |
|
|
7C |
System No. 2 Malfunction of pump inter lock |
Cooling water pump interlock actuated |
Fault codes – 80 to 99
|
Fault code |
Fault explanation |
Possible causes |
Origin of fault |
|
80 |
Malfunction of entering water temperature thermistor |
Defective connector contact Defective entering water temperature thermistor |
Other |
|
81 |
Malfunction of leaving water temperature thermistor or drain pipe heater |
Defective connector contact Defective leaving water temperature thermistor |
Other |
|
82 |
System No. 1 Malfunction of refrigerant thermistor |
Defective connector contact Defective refrigerant thermistor |
Other |
|
83 |
System No. 2 Malfunction of refrigerant thermistor |
Defective connector contact Defective refrigerant thermistor |
Other |
|
84 |
System No. 1 Malfunction of heat exchanger thermistor |
Defective connector contact Defective heat exchanger thermistor |
Other |
|
85 |
System No. 2 Malfunction of heat exchanger thermistor |
Defective connector contact Defective heat exchanger thermistor |
Other |
|
86 |
System No. 1 Malfunction of discharge pipe thermistor |
Defective connecting connector Defective discharge pipe thermistor |
Other |
|
88 |
System No. 2 Malfunction of discharge pipe thermistor |
Shortage of gas Defective discharge pipe thermistor Defective connector contact Clogged refrigerant piping |
Other |
|
89 |
Malfunction of brazed-plate heat exchanger freezing |
Dirty heat exchanger Shortage of refrigerant amount Defective thermistor |
Other |
|
8A |
System No. 2 Malfunction of leaving water temperature thermistor |
Defective connector contact Defective leaving water temperature thermistor |
Other |
|
8E |
System No. 1 Malfunction of suction pipe thermistor 1 for heating |
Defective connector contact Defective suction pipe thermistor |
Other |
|
8F |
System No. 1 Malfunction of suction pipe thermistor 2 for heating |
Defective connector contact Defective suction pipe thermistor |
Other |
|
8H |
Abnormal hot water high temperature |
Three way valve malfunction Defective thermistor Defect of water temperature setting |
Other |
|
90 |
Abnormal chilled water quantity or abnormal AXP |
Shortage of water volume Disconnection of AXP |
Other |
|
91 |
System No. 2 Malfunction of electronic expansion valve |
Defective connector contact Defective electronic expansion valve coil |
Other |
|
92 |
System No. 2 Malfunction of suction pipe thermistor |
Defective connector contact Defective suction pipe thermistor |
Other |
|
94 |
Malfunction of transmission (between heat reclaim ventilator and fan unit) |
Malfunction of transmission (between heat reclaim ventilator and fan unit) |
Other |
|
95 |
System No. 1 Malfunction of inverter system |
Defective fan inverter unit |
Other |
|
96 |
System No. 2 Malfunction of inverter system |
Defective fan inverter unit |
Other |
|
97 |
Malfunction of thermal storage unit |
Defective thermal storage unit |
Other |
|
98 |
Malfunction of thermal storage brine pump |
Actuation of thermal storage brine pump overcurrent (OC) |
Other |
|
99 |
Malfunction of thermal storage brine tank |
Low water level of thermal storage brine tank |
Other |
Time to call the experts?
If you are still having issues – it’s time to call in the experts. Our Brisbane-based air conditioning repairs team are on hand to give you the assistance you need. Call us on 07 3283 5566 or fill out a quick quote to get your air con back up and running!
