Alarm code
44
Activation of the low pressure increase protection device.
•
The RUN indicator flashes and the ALARM indication is displayed on the remote control switch.
•
The unit no., the alarm code and the unit code are alternatively displayed in the temperature setting section and the unit
no. and alarm code are displayed on the outdoor unit's PCB1 display.
* In the case that the compressor operates under a greater suction pressure (Ps) condition than 1.4 MPa for 1 minute,
all the compressors stop operating and retry operation is started after three minutes. However, this alarm is indicated
when the same phenomenon occurs twice in the next thirty minutes.
Is there a leak in the
solenoid valve (SVA)?
Is the low-pressure sensor normal?
Check if the indoor/outdoor intake
air temperature is too high.
Replace the low-pressure sensor
if faulty.
Replace the solenoid valve (SVA)
if faulty.
No
No
Yes
Yes
Is the reversing valve spindle
mounted at middle position?
Replace the reversing valve if faulty.
No
Yes
PCB1: Control PCB in Outdoor Unit
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Excessively
Low Suction
Pressure
Check outlet pipe temp.
of solenoid valve (SVA).
Check connecting wires.
Replace solenoid valve
(SVA) if faulty.
Leakage of Solenoid
Valve (SVA)
Measure suction gas
pipe temp. of reversing
valve.
Replace reversing valve
if faulty.
Valve Stoppage at Middle
Position of Reversing Valve
Check connectors of
PCB1 and power source.
Replace sensor if faulty.
Abnormal Suction
Pressure Sensor
Check indoor unit and
outdoor unit suction
air temp. thermistor.
Replace thermistor
if faulty.
Excessively High Indoor
Unit and Outdoor Unit
Suction Air Temperature
8 Troubleshooting
217
SMGB0065 rev. 1 - 12/2010
8
