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 |
|
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 |
|
|
No connection between indoor and outdoor unit |
|
E2 |
Led 1 |
|
|
|
Faulty - air temperature sensor shorted or broken |
|
E3 |
Led 1 |
|
|
|
Faulty evaporator temperature sensor (CN12 connector on the board) |
|
E4 |
Led 1 |
|
|
|
Faulty temperature sensor at the outlet of the evaporator (CN7 connector on the board) |
|
HER |
|
|
|
Led 4 |
Condensate drain pan overflow error |
|
E0 |
|
|
Led 3 Quik |
|
Air Conditioner Model Mismatch |
|
E7 |
Led 1 |
|
|
|
EPROM is faulty, you need to replace the board (microcircuit) or firmware |
|
Ed |
|
|
|
Led 4 |
Faulty external unit, watch errors for it |
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