Haier MRV5-H - Page 114

111
Failure code
Outdoor
digital
display tube:
43-0, 1
Indoor wired
controller:
2B
Indoor unit LED status
LED5 Failure description:
Outdoor unit compressor discharging tem-
perature (Td1, Td2) too low failure
20 times
Outdoor unit LED status
LED1 LED2
Normal Normal
1. Model Diagnosis and troubleshooting
MRV 5-HR series
DiagnosisT roubleshooting
2. Abnormity detection method
◆
Check if the temperature
detected by the oil temperature
sensor is correct.
◆
Check the outdoor unit
SV31, SV32, LEVb, etc. for
abnormal leakage and check
if the detected temperature is
correct;
◆
Check if the shutdown
indoor unit LEV of unit is closed
tightly, and if the running indoor
unit fan operates normally.
conditions
°C lasts for
5min.
4. Possible causes
◆
The probe of oil temperature
sensor falls off or is with
unsecure connection;
◆
The probe of oil temperature
sensor is misplaced;
◆
The oil temperature sensor
is with resistance drift;
◆
The outdoor unit LEVb,
SV31 and SV32 are with
leakage;
◆
The terminal of outdoor
unit LEVa1, 2 and LEVb is
connected incorrectly;
◆
For the unit, there is LEV
leakage in shutdown indoor
unit and non-operation of fan in
operating indoor unit;
◆
excessive refrigerant.
◆
The operation environment
is beyond the allowed range.
Check i f the resistance of dischargin g
temperature sensor is correct.
Check i f the sensor probe i s secure
and if the position is correct.
Check if the indoor unit LEV of “OFF”
is closed tightly and if the indoor unit
fan of “ON” is normal.
Check if the terminal o f outdoor unit
terminal L EVb, S V31 and S V32 i s
connected properly or is closed tightly.
Check if the outdoor unit LEVa1,
2 and L EVb are connected
properly and correctly.
Check i f the unit is filled with
excessive refrigerant.
Fill with refrigerant in
accordance with standard
quantity.
Replace it correctly by after-sales
personnel on site.
[Note]: Check if it is inserted,
connected and intersected with
another compressor, especially
when a single compressor operates.
Replace the discharging
temperature sensor by after-
sales personnel on site.
Replace the poor v alve ( with
leakage) and f an correctly by after-
sales personnel on site.
Replace t he poor v alve ( with
leakage) and fan correctly by after-
sales personnel on site.
Replace it correctly b y after-sales
personnel on site.
Check i f the computer boar d
can normally control the relate d
electronic expansion v alve a nd
solenoid valve, if not, replace it.
N
N
N
Y
Y
Y
N
N
Y
Y
N
Y