Haier AD50S2SM1FA - 4. Trouble Shooting

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3U55S2SR2FA 3U70S2SR2FA 4U75S2SR2FA 4U85S2SR2FA 5U105S2SS2FA
Code
Diagnosis
Code Diagnosis
IPM overcurrent or short circuit
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
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
System low pressure switch off
System low pressure protection.Refrigerant shortage,
Low defrosting temp.,Faulty of model code. 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
System high pressure switch off
8
System high pressure protection.Refrigerant overabundance,
High condensing temp. or malfunction of fan motor.
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
Compulsive Heating:
Frequency 50HZ; PMV 200 pulse;
Class 5 of outdoor fan motor.
Rated Operating
Definition of SW1 on Malfunction Display
Module thermal overload
24
25
26
27
28
Loss of synchronism detection
Indoor thermal overload
42
43
44
45
38
ON
OFFOFF
OFF
Time Defrost Valid
ON
ONONON
Detection for Wrong Wiring
0150526300
Compulsive Cooling:
Frequency 60HZ; PMV 200 pulse;
Class 7 of outdoor fan motor.
Malfunction of liquid pipe temp. sensor for indoor unit A
29
30
31
32
33
34
35
36
40
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 gas pipe temp. sensor for indoor unit A
Malfunction of gas pipe temp. sensor for indoor unit B
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
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 Unit
* MCU:Micro Control Unit
* PMV:Pulse Modulated Valve
Momentary power failure detection
Malfunction of liquid pipe temp. sensor for indoor unit E
PRODUCT DIAGNOSIS PROCEDURE
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