138
3U52S2SG1FA 3U68S2SG1FA 4U70S2SH1FA 4U85S2SH1FA
PRODUCT DIAGNOSIS PROCEDURE
Malfunction
Code
Diagnosis
Malfunction
Code
Diagnosis
IPM overcurrent or short circuit
21
20
23
18
Module operated overload
Module low or high voltage
Communication failure between Module and ECU
Module current detect circuit malfunction
MCU reset
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 defrosting temp. sensor
Malfunction of compressor suction temp. sensor
Malfunction of condensing temp. sensor
Malfunction of ambient temp. sensor
Malfunction of compressor discharge temp. sensor
Malfunction of ‘Toci’temp. sensor
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 start failure
Module input overcurrent
Malfunction of the DC fan motor
Diagnosis using the Numeral Light Indicator
0150520847
Precautions
For Adding Refrigerant
1.This system must use refrigerant R32.
2.Add refrigerant 20g/meter in outdoor
units 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.
System high pressure switch off
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 ”3”
to ON position of SW7,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 Unit
* MCU:Micro Control Unit
* PMV:Pulse Modulated Valve
OFF OFF OFF OFF
ON OFF OFF OFF
OFF ON
OFF OFF
OFF OFF ON OFF
1 2 3 4
Definition
State when out of factory (Normal Operating)
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 thermal overload
24
25
26
27
28
29
Loss of synchronism detection
30
31
32
34
35
36
39
40
To Next Page
Loading...
