MrCool DIY E Star Series Manuale utente

Due to updates and constantly improving performance, the information and instructions

within this manual are subject to change without notice. Please visit

www.mrcool.com/documentation to ensure you have the latest version of this manual.

Version Date: 10-22-21

Troubleshooting &

Solutions Guide

DIY® E Star™

4th Generation

Series

Contents

1. Safety Caution .......................................................................................................3

2. General Troubleshooting......................................................................................4

3. Complain Record Form..........................................................................................6

4. Information Inquiry ...............................................................................................8

5. Error Diagnosis and Troubleshooting Without Error Code...............................11

5.1 Remote maintenance...................................................................................11

5.2 Field maintenance.......................................................................................12

6. Quick Maintenance by Error Code......................................................................17

7. Troubleshooting by Error Code...........................................................................18

7.1 EH 00 / EC 51 (EEPROM parameter error diagnosis and solution)...........18

7.2 EL 01 (Indoor and outdoor unit communication error diag. and solution).. 19

7.3 EH 02 (Zero-crossing detection error diagnosis and solution). ................... 21

7.4 EH 03 / EC 07 (Fan speed is operating outside of the normal range

diagnosis and solution) .............................................................................. 22

7.5 EH 60/EH 61/EC 53/EC 52/EC 54/EC 56 (Open circuit or short circuit of

temperature sensor diagnosis and solution)............................................... 25

7.6 EH 0b (Indoor PCB / Display board communication error diagnosis and

solution) ..................................................................................................... 26

7.7 EL 0C (Refrigerant Leakage Detection diagnosis and solution) ................ 27

Troubleshooting

Contents

7.8 PC 08 (Overload current protection diagnosis and solution) .................... 28

7.9 PC 00 (IPM malfunction or IGBT over-strong current protection diagnosis

and solution) ............................................................................................. 29

7.10 PC 01 (Over voltage or too low voltage protection diag. and solution)...... 30

7.11 PC 02 (High temperature protection of IPM module or high pressure

protection diagnosis and solution) ............................................................ 31

7.12 PC 04 (Inverter compressor drive error diagnosis and solution)............... 33

7.13 PC 03 (Low pressure protection diagnosis and solution).......................... 34

8. Check Procedures.. ............................................................................................. 36

Troubleshooting

Troubleshooting 3

1. Safety Caution

WARNING

Be sure toturn off all power supplies or disconnect all wires to avoidelectric shock.

While checking indoor/outdoor PCB, pleaseequip oneself with anti-static gloves or wrist

strap to avoid damage to the board.

WARNING

Electricity remains in capacitors even when the power supply is off.

Ensure the capacitors are fully discharged before troubleshooting.

Test the voltage between P and N on back of the main PCB with multimeter. If the voltage is lower than 36V, the

capacitors are fully discharged.

Note: This picture is for reference only. Actual appearance may vary.

Troubleshooting 4

2. General Troubleshooting

2.1 Error Display (Indoor Unit)

When the indoor unit encounters a recognized error, the operation lamp will ﬂash in a corresponding series, the timer

lamp may turn on or begin ﬂashing, and an error code will be displayed. These error codes are described in the following

table:

Operation

Lamp

Timer

Lamp

LED

Display Error Information Solution

1 time OFF EH 00 Indoor unit EEPROM parameter error TS18

2 times OFF EL 01 Indoor /outdoor unit communicationerror TS19

3 times OFF EH 02 Zero-crossing signal detection error (for some models) TS21

4 times OFF EH 03 The indoor fan speed is operating outside of the normal range TS22

5 times OFF EC 51 Outdoor unit EEPROM parameter error (for some models) TS18

5 times OFF EC 52 Condenser coil temperature sensor T3 is in open circuit or has short

circuited TS25

5 times OFF EC 53 Outdoor room temperature sensor T4 is in open circuit or has short

circuited TS25

5 times OFF EC 54 Compressor discharge temperature sensor TP is in open circuit or

has short circuited TS25

5 times OFF EC 56 Evaporator coil outlet temperature sensor T2B is in open circuit or

has short circuited (for free-match indoor units) TS25

6 times OFF EH 60 Indoor room temperature sensor T1 is in open circuit or has short

circuited TS25

6 times OFF EH 61 Evaporator coil temperature sensor T2 is in open circuit or has short

circuited TS25

12 times OFF EC 07 The outdoor fan speed is operating outside of the normal range

for some models)TS22

9 times OFF EH 0b Indoor PCB / Display board communication error TS26

8 times OFF EL 0C Refrigerant leak detected TS27

7 times FLASH PC 00 IPM malfunction or IGBT over-strong current protection TS29

2 times FLASH PC 01 Over voltage or over low voltage protection TS30

3 times FLASH PC 02 High temperature protection of IPM module or High pressure

protection (for some models) TS31

5 times FLASH PC 04 Inverter compressor drive error TS33

1 time FLASH PC 08 Current overload protection (for some models) TS28

7 times FLASH PC 03 Low pressure protection (for some models) TS34

1 times ON -- Indoor units mode conﬂict (match with multi outdoor unit) --

Troubleshooting 5

For other errors:

The display board may show a garbled code or a code undeﬁned by the service manual. Ensure that this code is not a

temperature reading.

Troubleshooting:

Test the unit using the remote control. If the unit does not respond to the remote, the indoor PCB requires replacement.

If the unit responds, the display board requires replacement.

LED ﬂash frequency:

... ...

2.2 Error Display (For Some Outdoor Units)

There are 2 LED lights (RED color and GREEN color) welded in outdoor main board. After power on, LED show different

actions when encounter different problems.

No. Problem LED(GREEN) LED(RED) Solution

1 Standby normally ON OFF -

2 Operate normally OFF ON -

3 Compressor driven chip EEPROM parameter error ON FLASH TS19

4 IPM malfunction or IGBT over-strong current protection Flash OFF TS30

5 Over voltage or too low voltage protection ON ON TS31

6 Inverter compressor drive error OFF FLASH TS34

7 Inverter compressor drive error Flash LIGHT TS34

8Communication error between outdoor main chip and

compressor driven chip flash FLASH TS19

Troubleshooting 6

3. Complain Record Form

Complain Record Form

Request No.: Date:

Installation Date: Service Date:

Customer Information

Name Telephone No.

Home Address

Product Information

Indoor Unit Model Outdoor Unit Model

Serial No. of indoor unit

Serial No. of outdoor unit

Working Mode □Cooling □Heating □Fan only □Dry

Setting temperature °C / °F Fan speed □Turbo □High □Medium □Low

□Auto

Temperature of air inlet °C / °F Temperature of air

outlet °C / °F

Installation / Condition Information

Indoor temperature °C / °F Indoor humidity %RH

Outdoor temperature °C / °F Outdoor humidity %RH

Length of Connecting pipe Pipe diameter Gas pipe: Liquid pipe:

Length of Wiring wire diameter

System Running Pressure MPa or Bar or PSI

Room size (L*W*H)

Photo of Installation of In-

door unit

(Photo #1)

Photo of Installation

of Outdoor unit

(Photo #2)

Failure Description

Error Code of Indoor unit Code of Outdoor

PCB

Unit does not start

Remote control does not work

Indoor display shows nothing

No cooling or heating at all

Less cooling or heating

Unit starts but stops shortly

High noise

High vibration

Troubleshooting 7

Parameter Checking information by Remote controller

Displaying code Displaying code meaning Display value Display value meaning

T1 Room temperature

T2 Indoor coil temperature

T3 Outdoor coil temperature

T4 Ambient temperature

Tb Outlet temperature of

indoor coil

TP Discharge temperature

TH Sunction temperature

FT Targeted Frequency

Fr Actual Frequency

IF Indoor fan speed

OF Outdoor fan speed

LA EXV opening steps

CT Compressor continuous

running time

ST Causes of compressor

stop.

A0, A1, b0, b1, b2, b3, b4,

b5, b6, dL, Ac, Uo, Td, dA,

dS, dT

Reserved

Approval from Manufacturer

□Approved

□More Proof needed

□Rejected

Troubleshooting 8

4. Information Inquiry

• To enter information inquiry status, complete the following procedure within ten seconds:

•

Press LED (or DO NOT DISTURB)

3 times.

•

Press SWING (or AIR DIRECTION) 3 times.

• Finish 1 and 2 within 10 seconds, you will hear beeps for two seconds, which means the unit goes into parameter

checking mode.

• Use the LED (or DO NOT DISTURB) and SWING (or AIR DIRECTION) buttons to cycle through information displayed.

• Pressing LED (or DO NOT DISTURB) will display the next code in the sequence. Pressing SWING (or AIR

DIRECTION) will show the previous.

• The following table shows information codes. The screen will display this code for two seconds, then the information

for 25 seconds.

Troubleshooting 9

Displayed code Explanation Displayed

value Meaning Additional Notes

Room temperature

-1F,-1E,-1d,-1c,-

1b,-1A

-19—99

A0,A1,…A9

b0,b1,…b9

c0,c1,…c9

d0,d1,…d9

E0,E1,…E9

F0,F1,…F9

-25,-24,-23,-22,

-21,-20

-19—99

100,101,…109

110,111,…119

120,121,…129

130,131,…139

140,141,…149

150,151,…159

1. All displayed temperatures

use actual values.

2. All temperatures are

displayed in °C regardless

of remote used.

3. T1, T2, T3, T4, and T2B

display ranges from -25 to

70 °C. TP display ranges

from -20 to 130 °C.

4. The frequency display

ranges from 0 to 159HZ.

5. If the actual values exceed

or fall short of the deﬁned

range, the values closest

to the maximum and

minimum values will be

displayed.

Indoor coil

temperature

Outdoor coil

temperature

Ambient

temperature

Outlet temperature

of indoor coil

Discharge

temperature

Suction temperature

Targeted frequency

Actual frequency

IF Indoor fan speed

1,2,3,4

14-FF

OFF

Low speed, Medium

speed, High speed,

Turbo.

Actual fan speed is

equal to the display

value converted to

decimal value and

multiplied by 10. This

is measured in RPM.

N/A

Used for some large capacity

motors.

Used for some small capacity

motors.

The display value is 14-FF

(hexadecimal). The

corresponding fan speed

ranges from 200 to 2550 RPM.

OF Outdoor fan speed

LA EXV opening angle 0-FF

Actual EXV opening

value is equal to

the display value

converted to decimal

value and then

multiplied by2.

Compressor

continuous running

time

0-FF 0-255 minutes

If the actual value exceeds

or falls short of the deﬁned

range, the value closest to the

maximum and minimum will

be displayed.

ST Causes of

compressor stop 0-99

For a detailed

explanation, contact

technical support.

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