25
Installation and Maintenance
Service Manual
14/18K:
24/28K:
43 Communication failure with Unit A
●
Ƽ
●
●
44 Communication failure with Unit B
Ƽ
Ƽ
●
●
45 Communication failure with Unit C
○
○
Ƽ
●
46 Communication failure with Unit D
●
○
Ƽ
●
47 Unit A freeze protection
Ƽ
○
Ƽ
●
48 Unit B freeze protection
○
●
Ƽ
●
49 Unit C freeze protection
●
●
Ƽ
●
50 Unit D freeze protection
Ƽ
●
Ƽ
●
51 Unit A
overheating prevention protection
○
Ƽ
Ƽ
●
52 Unit B
overheating prevention protection
●
Ƽ
Ƽ
●
53 Unit C
overheating prevention protection
Ƽ
Ƽ
Ƽ
●
54 Unit D
overheating prevention protection
○
○
○
Ƽ
55 Unit A communication wire misconnection or expansion valve malfunction
●
○
○
Ƽ
56 Unit B communication wire misconnection or expansion valve malfunction
Ƽ
○
○
Ƽ
57 Unit C communication wire misconnection or expansion valve malfunction
○
●
○
Ƽ
58 Unit D communication wire misconnection or expansion valve malfunction
●
●
○
Ƽ
Note: discharge the position in below pictures with discharge resistance after open the top cover and
check if the voltage is below 20V with universal meter, then begin to check.
1 IPM protection malfunction:
Main checking point:
● If the input voltage of the unit is within normal range?
● If the connection wire of compressor is connected well? Is it loose? If the connection sequence is correct?
●
If the resistance of compressor coil is normal? If the isolation of compressor coil with copper pipe is good?
●
If the unit is overloaded? If the heat radiation of the unit is good?
●
If the refrigerant charge is suitable?
Flow chart:
9.2 Malfunction Checking and Elimination
14/18K:
24/28K:
43 Communication failure with Unit A
●
Ƽ
●
●
44 Communication failure with Unit B
Ƽ
Ƽ
●
●
45 Communication failure with Unit C
○
○
Ƽ
●
46 Communication failure with Unit D
●
○
Ƽ
●
47 Unit A freeze protection
Ƽ
○
Ƽ
●
48 Unit B freeze protection
○
●
Ƽ
●
49 Unit C freeze protection
●
●
Ƽ
●
50 Unit D freeze protection
Ƽ
●
Ƽ
●
51 Unit A
overheating prevention protection
○
Ƽ
Ƽ
●
52 Unit B
overheating prevention protection
●
Ƽ
Ƽ
●
53 Unit C
overheating prevention protection
Ƽ
Ƽ
Ƽ
●
54 Unit D
overheating prevention protection
○
○
○
Ƽ
55 Unit A communication wire misconnection or expansion valve malfunction
●
○
○
Ƽ
56 Unit B communication wire misconnection or expansion valve malfunction
Ƽ
○
○
Ƽ
57 Unit C communication wire misconnection or expansion valve malfunction
○
●
○
Ƽ
58 Unit D communication wire misconnection or expansion valve malfunction
●
●
○
Ƽ
Note: discharge the position in below pictures with discharge resistance after open the top cover and
check if the voltage is below 20V with universal meter, then begin to check.
1 IPM protection malfunction:
Main checking point:
● If the input voltage of the unit is within normal range?
● If the connection wire of compressor is connected well? Is it loose? If the connection sequence is correct?
●
If the resistance of compressor coil is normal? If the isolation of compressor coil with copper pipe is good?
●
If the unit is overloaded? If the heat radiation of the unit is good?
●
If the refrigerant charge is suitable?
Flow chart:
Gas pipe temperature sensor malfunction of A
Flash 18 times
Liquid pipe temperature sensor malfunction of B
Flash 19 times
Gas pipe temperature sensor malfunction of B
Flash 20 times
Liquid pipe temperature sensor malfunction of C
Flash 21 times
Gas pipe temperature sensor malfunction of C
Flash 22 times
Liquid pipe temperature sensor malfunction of D
Flash 23 times
Gas pipe temperature sensor malfunction of D
Flash 24 times
Liquid pipe temperature sensor malfunction of E
Flash 25 times
Gas pipe temperature sensor malfunction of E
Flash 26 times
Exit of the condenser tube sensor malfunction
Flash 27 times
Correspondence is normal
Flash 7
times(n=indoor
unit number)
Communication failure between indoor unit and
outdoor unit
Often bright
(indoor unit all
Communication
failure)
Indoor ambient sensor malfunction
F1
Indoor evaporate sensor malfunction
F2
Mode conflict
E7
Accept fluorine mode
Fo
Jumper cap malfunction protection
C5
Anti-freezing protection
FH
