Error codes, malfunctions and repair of MDV air conditioners

MDV air conditioners have a self-diagnosis system. This means that in the event of a malfunction, the air conditioner issues an error code. By the error code of the MDV air conditioner, it is easy enough to identify the problem.

 

This page provides error codes for various types of MDV equipment.

Error codes for household split systems MDV

AURORA Series (MDSA)

Display

Error descriptions

E0

Error reading EEPROM, internal block

E1

Error reading EEPROM, internal block

Ez

No indoor fan control

E4

Error on the temperature sensor T1 (T room)

E5

Error on the T2 sensor (T boiling)

EC

Refrigerant leak

F1

Error on the T4 sensor ( Outdoor unit, T outdoor)

F2

Error TK sensor ( Nar uzhny block , T condensing)

F3

Failed Sensor T5 ( Nar uzhny block , T injection)

F4

Error reading EEPROM, outdoor unit

F5

No outdoor fan control

P0

IPM fault or overcurrent

P1

Supply voltage too low or too high

P2

Compressor overheating

P4

Inverter module error

FAIRWIND Series (MDSF)

LED Operation

LED Timer

Display

Error Code Descriptions

Blinks 1 time

Off

E1

Error reading EEPROM checksum

Blinks 2 times

Off

E2

Error controlling signal transition through 0

Blinks 3 times

Off

Ez

Error controlling the fan speed of the indoor unit

Blinks 5 times

Off

E5

Error thermistor T1 indoor unit (air sensor)

Blinks 6 times

Off

E6

Thermistor Error T2 Indoor Unit (Tube Sensor)

Blinks 7 times

Off

E7

Error thermistor TK outdoor unit (only for 24 and 28 kBTU )

Blinks 2 times

Glows

EC

Refrigerant leak detected

Blinks 8 times

Off

E8

reserve

Blinks 9 times

Off

E9

Inter-unit communication error (only for 24 and 28 kBTU )

Note: depending on the model of the air conditioner, the error code may be displayed on a digital display or on the mode LEDs.

Error codes for multi-split MDV systems

Series Outdoor Units (MD * O - ** HFN1)

Display

Error Descriptions

E0

Error reading EEPROM checksum

E2

Block Error

E3

Communication error "control board - inverter board"

E4

Error of outdoor unit temperature sensors

E5

Too low or high voltage

E8

Error of control of turns of the fan of the outdoor unit

F1

Indoor Unit A Thermistor Error

F2

Indoor Unit B Thermistor Error

F3

Indoor Unit C Thermistor Error

F4

Indoor Unit D Thermistor Error

F5

Indoor Unit E Thermistor Error

P1

Protection on P high (MD40-28HFN1, MD40-36HFN1, MD50-42HFN1)

P2

P protection low (MD40-28HFN1, MD40-36HFN1, MD50-42HFN1)

RZ

Compressor current protection

P4

High T sewn

P5

Compressor overheating

P6

Inverter module malfunction

LP

Too low T of outdoor air

Note: all error codes are automatically erased after 30 seconds after eliminating / disappearing the error, except for E2 / EZ.

 

Indoor units of wall, channel and cassette types.

 

Designations:

• O-glows;

• X-off;

• /// - blinks at a frequency of 2 Hz.

Error code

Description of malfunction

LED Timer

LED Operation
(blinks,
number of
times)

E0

Error reading EEPROM checksum

X

1

E1

Block Error

X

2

E3

Error controlling the fan speed of the indoor unit

X

4

E4

Thermistor T1 error (indoor unit)

X

5

E5

Thermistor T2 error (indoor unit)

X

6

HER

Error on the condensate level sensor (sensor or level)

X

8

F0

Over current (not all models)

О

1

F1

Thermistor T4 error (outdoor unit)

О

2

F2

Thermistor error TK (outdoor unit)

О

3

F3

Thermistor T5 error (outdoor unit)

О

4

F4

Error reading EEPROM checksum (outdoor unit), not all models

О

5

F5

Error in fan speed control (outdoor unit)

О

6

F6

T2V Thermistor Error (Indoor Unit)

О

7

F7

Reserve

О

8

F8

Reserve

О

9

F9

Reserve

О

10

P0

Inverter module malfunction (see codes for outdoor unit)

III

1

P1

Too low or high voltage

III

2

RZ

Too low T of outdoor air

III

4

P4

Compressor Error (see Open Unit)

III

5

P5

Mode conflict

III

6

P6

Low pressure protection

III

7

EC

Refrigerant leak detected

X

7

E2

Sync error

X

3

P2

Compressor overheating

III

3

Indoor Console Type Blocks

 

Designations:

• O-glows;

• X-off;

• /// - blinks at a frequency of 2 Hz.

Description of malfunction

Timer lamp

Operation Lamp (blinks, number of times)

Error reading EEPROM checksum

X

1

Block Error

X

2

Error controlling the fan speed of the indoor unit

X

4

Thermistor T1 error (indoor unit)

X

5

Thermistor T2 error (indoor unit)

X

6

Over current (not all models)

O

1

Thermistor T4 error (outdoor unit)

O

2

Thermistor error TK (outdoor unit)

O

3

Thermistor T5 error (outdoor unit)

O

4

Error reading EEPROM checksum (outdoor unit), not all models

O

5

Error in fan speed control (outdoor unit)

O

6

T2V Thermistor Error (Indoor Unit)

O

7

Inverter module malfunction (see codes for outdoor unit)

III

1

Too low or high voltage

III

2

Too low T of outdoor air

III

4

Compressor error (see outdoor unit)

III

5

Mode conflict

III

6

Low pressure protection

III

7

Error codes for semi-industrial split systems MDV

Outdoor units

Error content

LED 1

LED 2

LED 3

Phase rotation

III

X

X

Lack of phase (A, B)

III

X

X

Lack of phase (C)

X

X

X

Low pressure protection

III

III

X

Over current

X

X

III

Board malfunction

III

X

III

Short circuit or short circuit of the sensor circuit TK

X

III

III

Short circuit or short circuit of the T4 sensor circuit

X

III

X

Capacitor overheat protection

III

III

III

Note: occasional flashing of LEDs 1, 2, 3 means that the system is in standby mode.

Indoor units of floor-ceiling (MDUE), channel (MDTB), full-size cassette (MDCD), compact cassette (MDCA3) types

Protection or fault

moning

timer

defrosting

alarm

error code

Air sensor T

X

III

X

X

E2

Refrigerant Sensor T

III

X

X

X

E3

Condensation sensor T (for 18 and 24 kBTU )

X

X

III

X

E4

Error reading EEPROM

III

III

X

X

E7

Excess condensate level in the pan

X

X

X

III

E8

Refrigerant leak (if equipped)

III

X

X

III

EC

Column Type Indoor Unit (MDFM)

Error code

Protection or fault

P4

T evaporator protection

P5

High T condensation protection

P9

Cold air blow protection

E1

Air sensor T

E2

Refrigerant Sensor T

E3

Condensation Sensor T

E6

Outdoor unit malfunction

HS

Defrost mode works

P0

There is no communication between the control board of the indoor unit and the display (J2, S4)

Midea Series LCAC DC Inverter: Internal 4-line cassette models

Error Codes

Running

Timer

Defrost

Alarm

Description

E1

 

Led2
Quik
Flash

 

 

No connection between indoor and outdoor unit

E2

Led 1
Quik
Flash

 

 

 

Faulty - air temperature sensor shorted or broken

E3

Led 1
Quik
Flash

 

 

 

Faulty evaporator temperature sensor (CN12 connector on the board)

E4

Led 1
Quik
Flash

 

 

 

Faulty temperature sensor at the outlet of the evaporator (CN7 connector on the board)

HER

 

 

 

Led 4
Quik
Flash

Condensate drain pan overflow error

E0

 

 

Led 3 Quik
Flash

 

Air Conditioner Model Mismatch

E7

Led 1
Quik
Flash

 

 

 

EPROM is faulty, you need to replace the board (microcircuit) or firmware 

Ed

 

 

 

Led 4
Quik
Flash

Faulty external unit, watch errors for it

MDV Air Conditioner's Error Codes
MDV AURORA ERP 3D DC-Inverter
Comments: 4
  • #4

    Mo afzal (Tuesday, 10 August 2021 18:42)

    ac mdv invertar error code ec what problam

  • #3

    Kim Noel Principio (Saturday, 24 April 2021 03:53)

    Hi
    need help parts manual of MDV Model WMV-26/QD3GW please

  • #2

    alan baird (Thursday, 18 February 2021 00:11)

    model WMDV-35/QC8GW Has a E1 error, how to check this and repair.

  • #1

    karina evans (Wednesday, 02 December 2020 08:45)

    Our MDV airconditioner timer light is flashing and system wont work