Hisense Hi-FLEXi S Series Technical, Installation, Maintenance page 173

Troubleshooting
Alarm
44
Code
● The RUN indicator (Red) is flashing
● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on
LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB.
★ When the suction pressure (Ps) continues to be higher than 1.6MPa for more than one minute,all the compressors stop
and then retry the operation after 3 minutes.
This alarm code is indicated when this occurs twice more within the next 30 minutes.
Is there a leak in the
solenoid valve (SVA)?
Is the reversing valve spindle
mounted at middle position?
Is the low-pressure sensor normal?
Check that the indoor/outdoor intake
air temperature is not too high.
Phenomenon
Excessively
Low Suction
Pressure
Activation of Low Pressure Increase Protection Device
Yes
No
Yes
No
No
Yes
Cause
Leakage of Solenoid
Valve (SVA)
Valve Stoppage at Middle
Position of Reversing Valve
Abnormal Suction
Pressure Sensor
Excessively High Indoor
Unit and Outdoor Unit
Suction Air Temperature
O.U. PCB: Outdoor Unit PCB
Replace the reversing valve if faulty.
Check Item
Check outlet pipe temp.
of solenoid valve (SVA).
Measure suction gas
pipe temp. of reversing
valve.
Check connectors
of O.U. PCB and
power supply.
Check indoor unit and
outdoor unit suction
air temp. thermistor.
164
Replace the solenoid valve (SVA)
if faulty.
Replace the low-pressure sensor
if faulty.
Action
(Turn OFF Main Switch)
Check connecting wires.
Replace solenoid valve
(SVA) if faulty.
Replace reversing valve
if faulty.
Replace sensor if faulty.
Replace thermistor
if faulty.