Monday, February 23, 2015

DAIKIN INVERTER AC ERROR CODES

DAIKIN INVERTER 

AC  

ERROR CODES


Indoor Unit
FTXS30LVJU
FTXS36LVJU

Outdoor Unit
RKS30LVJU
RKS36LVJU

U0
Refrigerant Shortage
Refrigerant shortage detection I:
Refrigerant shortage is detected by checking the input current value and the compressor running frequency. If the refrigerant is short, the input current is lower than the normal value.

Refrigerant shortage detection II:

Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of the electronic expansion valve. If the refrigerant is short, the discharge pipe temperature tends to rise.

Refrigerant shortage detection III:

Refrigerant shortage is detected by checking the difference between suction and discharge
temperature.

Supposed Causes


 Disconnection of the discharge pipe thermostat, indoor or outdoor heat exchanger  thermostat, room or outdoor temperature thermistor

 Closed stop valve

 Refrigerant shortage (refrigerant leakage)

 Poor compression performance of compressor

 Defective electronic expansion valve.
U2
Low-voltage Detection or Over-voltage Detection
Indoor Unit


The zero-cross detection of the power supply is evaluated by the indoor unit PCB.

Outdoor Unit

Low-voltage detection:

An abnormal voltage drop is detected by the DC voltage detection circuit.

Over-voltage detection:
An abnormal voltage rise is detected by the over-voltage detection circuit.

Supposed Causes


 Supply voltage is not as specified.

 Defective DC voltage detection circuit

 Defective over-voltage detection circuit

 Defective PAM control part

 Disconnection of compressor harness
 Noise
 Momentary fall of voltage
 Momentary power failure
 Defective indoor unit PCB


U4
Signal Transmission Error (between Indoor Unit and Outdoor Unit)
The data received from the outdoor unit in indoor unit-outdoor unit signal transmission is checked whether it is normal.


The data sent from the outdoor unit cannot be received normally, or the content of the data is abnormal.


Supposed Causes


Wiring error

Breaking of the connection wires between the indoor and outdoor units (wire No. 3)

Defective outdoor unit PCB

Defective indoor unit PCB

Disturbed power supply waveform.


U7
Signal Transmission Error on Outdoor Unit PCB
Communication error between microcomputer mounted on the main microcomputer and PM1.


The abnormality is determined when the data sent from the PM1 can not be received for 9

seconds.

 The error counter is reset when the data from the PM1 can be successfully received.

 Supposed Causes

Defective outdoor unit PCB.

UA
Unspecified Voltage
The supply power is detected for its requirements (different from pair type and multi type) by the


indoor / outdoor transmission signal.

The pair type and multi type are interconnected.

Supposed Causes


 Wrong models interconnected

 Wrong wiring of connecting wires

 Wrong indoor unit PCB or outdoor unit PCB mounted

 Defective indoor unit PCB

 Defective outdoor unit PCB

E1
Outdoor Unit PCB Abnormality
 The system checks if the microprocessor is working in order.


 The system checks if the zero-cross signal comes in properly.

 The microprocessor program runs out of control.

 The zero-cross signal is not detected.

Supposed Causes


 Defective outdoor unit PCB

 Broken harness between PCBs

 Noise

 Momentary fall of voltage

 Momentary power failure, etc.


E5
OL Activation
A compressor overload is detected through compressor OL.


 If the error repeats, the system is shut down.

 Reset condition: Continuous run for about 60 minutes without any other error

* The operating temperature condition is not specified.

Supposed Causes


 Defective discharge pipe thermistor

 Defective electronic expansion valve or coil

 Defective FourWay valve or coil

 Defective outdoor unit PCB

 Refrigerant shortage
 Water mixed in refrigerant
 Defective stop valve.


E6
Compressor Lock
A compressor lock is detected by checking the compressor running condition through the position detection circuit.

09/12 class

 Operation stops due to over current.

 If the error repeats, the system is shut down.

 Reset condition: Continuous run for about 11 minutes without any other error

15/18/24/30/36 class

 A compressor lock is detected by the current waveform generated when applying high frequency voltage to the motor.
 If the error repeats, the system is shut down
 Reset condition: Continuous run for about 5 minutes without any other error.

Supposed Causes


 Compressor locked

 Compressor harness disconnected

E7
DC Fan Lock
 An error is determined with the high-voltage fan motor rotation speed detected by the Hall  IC.


 The fan does not start in 15 ~ 30 seconds (depending on the model) even when the fan  motor is running.

 If the error repeats, the system is shut down.

 Reset condition: Continuous run for about 11 minutes (09/12 class) or 5 minutes (15/18/24/30/ 36 class) without any other error.

Supposed Causes


 Foreign matter stuck in the fan

 Defective fan motor

 Defective outdoor unit PCB


E8
Input Over current Detection
An input overcurrent is detected by checking the input current value with the compressor running.


 The current exceeds about 9.25 ~ 20 A for 2.5 seconds with the compressor running.

(The upper limit of the current decreases when the outdoor temperature exceeds a certain

level.)

Supposed Causes


 Outdoor temperature is out of operation range.

 Defective compressor

 Defective power module

 Defective outdoor unit PCB

 Short circuit

EA
FourWay Valve Abnormality
The room temperature thermistor and the indoor heat exchanger thermistor are checked if they


function within their normal ranges in each operation mode.

A following condition continues over 1 ~ 10 minutes after operating for 5 ~ 10 minutes.

 Cooling / Dry

(room thermistor temp. – indoor heat exchanger temp.) < –5°C (–9°F)

 Heating
(indoor heat exchanger temp. – room thermistor temp.) < –5°C (–9°F)
 If the error repeats, the system is shut down.

 Reset condition: Continuous run for about 60 minutes without any other error.
Supposed Causes


 Disconnection of fourway valve coil

 Defective fourway valve, coil, or harness

 Defective outdoor unit PCB

 Defective thermistor

 Refrigerant shortage
 Water mixed in refrigerant
 Defective stop valve


F3
Discharge Pipe Temperature Control
An error is determined with the temperature detected by the discharge pipe thermistor.
Supposed Causes


 Defective discharge pipe thermistor

(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)

 Defective electronic expansion valve or coil

 Refrigerant shortage

 Defective fourway valve
 Water mixed in refrigerant
 Defective stop valve
 Defective outdoor unit PCB


F6
High Pressure Control in Cooling
High-pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if the


temperature sensed by the outdoor heat exchanger thermistor exceeds the limit.

Supposed Causes

 The installation space is not large enough.

 Dirty outdoor heat exchanger

 Defective outdoor fan motor

 Defective stop valve

 Defective electronic expansion valve or coil
 Defective outdoor heat exchanger thermistor
 Defective outdoor unit PCB


H0
Compressor System Sensor Abnormality
 The system checks the DC current before the compressor starts.


 The DC current before compressor start-up is out of the range 0.5 ~ 4.5 V (sensor output

 converted to voltage value)

 The DC voltage before compressor start-up is below 50 V.
Supposed Causes


 Broken or disconnected harness

 Defective outdoor unit PCB


H0
 The system checks the supply voltage and the DC voltage before the compressor starts.


 The system checks the compressor current right after the compressor starts.

 The supply voltage and the DC voltage is obviously low or high.

 The compressor current does not run when the compressor starts.

Supposed Causes


 Disconnection of reactor

 Disconnection of compressor harness

 Defective outdoor unit PCB

 Defective compressor

H6
Position Sensor Abnormality
A compressor start-up failure is detected by checking the compressor running condition through the position detection circuit.


If the error repeats, the system is shut down.

Reset condition: Continuous run for about 11 minutes (09/12 class) or 5 minutes (15/18/24/30/ 36 class) without any other error

Supposed Causes


 Disconnection of the compressor relay cable

 Defective compressor

 Defective outdoor unit PCB

 Start-up failure caused by the closed stop valve

 Input voltage is outside the specified range.

H8
DC Voltage / Current Sensor Abnormality
DC voltage or DC current sensor abnormality is identified based on the compressor running


frequency and the input current.

 If the error repeats, the system is shut down.

 Reset condition: Continuous run for about 60 minutes without any other error
Supposed Causes


 Defective outdoor unit PCB


H8
CT or Related Abnormality
A CT or related error is detected by checking the compressor running frequency and CT-detected input current.
Supposed Causes

 Defective power module

 Broken or disconnected wiring

 Defective reactor

 Defective outdoor unit PCB


H9,J3,J6,P4
Thermistor or Related Abnormality (Outdoor Unit)
This fault is identified based on the thermistor input voltage to the microcomputer. A thermistor fault is identified based on the temperature sensed by each thermistor.
Supposed Causes


 Disconnection of the connector for the thermistor

 Defective thermistor corresponding to the error code

 Defective heat exchanger thermistor in the case of J3 error (outdoor heat exchanger thermistor in cooling operation, or indoor heat exchanger thermistor in heating operation)

Defective outdoor unit PCB


L3
Electrical Box Temperature Rise
 An electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off.


Supposed Causes

 Defective outdoor fan motor

 Short circuit

 Defective radiation fin thermistor

 Disconnection of connector

 Defective outdoor unit PCB

L4
Radiation Fin Temperature Rise
A radiation fin temperature rise is detected by checking the radiation fin thermistor with the


compressor on.

Supposed Causes


 Defective outdoor fan motor

 Short circuit

 Defective radiation fin thermistor

 Disconnection of connector

 Defective outdoor unit PCB
 Silicon grease is not applied properly on the radiation fin after replacing the outdoor unit PCB.

L5
Output Overcurrent Detection
An output overcurrent is detected by checking the current that flows in the inverter DC section.
Supposed Causes

 Poor installation condition

 Closed stop valve

 Defective power module

 Wrong internal wiring

 Abnormal power supply voltage
 Defective outdoor unit PCB
 Defective compressor