PRODUCT DIAGNOSIS PROCEDURE
Malfunction
Code
Diagnosis
Malfunction
Code
Diagnosis
21
Module overcurrent /
20
23
18
Malfunction of module temp.sensor
Module operated overload
IPM overcurrent or short circuit
Communication failure between Module and ECU
Communication cables broken or not well connected.
Module current detect circuit malfunction
MCU reset
Module low or high DC voltage (under 192V or above 375V)
Discharging temperature overheating.Lack of refrigerant,
ambient temperature too high or PMVs blocked.
17
4-way valve switching failure
Malfunction of gas pipe temp. sensor for indoor unit A
Malfunction of gas pipe temp. sensor for indoor unit C
Malfunction of gas pipe temp. sensor for indoor unit D
Malfunction of gas pipe temp. sensor for indoor unit E
Malfunction of liquid pipe temp. sensor for indoor unit A
Malfunction of liquid pipe temp. sensor for indoor unit B
Malfunction of liquid pipe temp. sensor for indoor unit C
Malfunction of liquid pipe temp. sensor for indoor unit D
Malfunction of liquid pipe temp. sensor for indoor unit E
9
10
11
12
13
15
1
2
4
5
6
Malfunction of the DC fan motor
Malfunction of defrosting temp. sensor
Malfunction of compressor suction temp. sensor
Malfunction of module temp.sensor
Malfunction of condensing temp. sensor
Malfunction of ambient temp. sensor
Malfunction of compressor discharge temp. sensor
Malfunction of piping temp. sensor
System high pressure switch off
System low pressure switch off
System low pressure protection.Refrigerant shortage,
Low defrosting temp., or malfunction of fan motor.
Faulty of outdoor unit EEPROM
Communication failure between indoor&outdoor unit
Compressor overcurrent
Input overcurrent
Diagnosis using the Numeral Light Indicator
0150512528
Precautions
For Adding Refrigerant
1.This system must use refrigerant R410A.
2.Add refrigerant 20g per meter when the
total piping length exceeds the standard
value,but make sure that the total liquid
piping length should be less than the
max value.
BTU
Std. Value Max Value
24000
19000
30
50
30
60
8
System high pressure protection.Refrigerant
overabundance,High condensing temp. or
malfunction of fan motor.
Notes:
1.When using this product,you need not to
set the address.But the L/N wires
between indoor & outdoor units must be
corresponded,or there will be
communication failure.
2.Quiet Operation Setting.Set the DIP ”8”
to ON position of SW5,the system will
run with lower noise,but the max
capacity will also reduce slightly.
3.Do NOT change the settings of other
switchs,wrong settings can make the
system damage or other malfunctions.
4.For some malfunctions, this system can
make back up running.
* ECU:Electronic Control Uni
MCU:Micro Control Unit
PMV:Pulse Modulated Valve
State when out of factory (Normal Operating)
OFF OFF OFF OFF
ON OFF OFF OFF
OFF ON OFF OFF
OFF OFF ON OFF
1 2 3 4
Definition
Compulsive Heating:Frequency 50HZ; PMV
200 pulse;Class 5 of outdoor fan motor.
Rated Operating
Compulsive Cooling:Frequency 60HZ; PMV
200 pulse;Class 7 of outdoor fan motor.
Definition of SW1 on Malfunction Display
Module temperature too high (Overload Protecter)
24
25
26
27
28
29
Module switch failure
30
31
32
34
35
36
39
40
Indoor overload
Indoor frosted
41
42
43
44
45
46
38
Malfunction of gas pipe temp. sensor for indoor unit B
33
16
Lack of refrigerant or discharging
30000
70
40
34000
80
40
26000
40
70
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