ϥ
“RUN” light is flashing and “ALARM” is indicated on the remote control switch.
ϥ
The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and
the unit No. and alarm code are indicated on the outdoor unit PCB1.
★
This alarm is indicated when a compression ratio,
İ
=
{
(Pd + 0.1) / (Ps + 0.06)
}
is calculated from
a discharge pressure (Pd MPa) and suction pressure (Ps MPa) and the condition lower than
İ
< 1.8 occurs more than three times (including three) in one hour.
Alarm
Code
Does the inverter operate?
Yes
Does the compressor operate?
Is the reversing valve spindle
mounted at middle position?
Are the high-pressure sensor and
the low-pressure sensor normal?
Yes
Check if the intake air temperature is
too low at the indoor or outdoor units.
Replace the high-pressure sensor
or the low-pressure sensor if faulty.
Check the compressor and
power cable.
Check the inverter.
Replace the reversing valve if faulty.
No
No
No
No
Is there a leak in the Solenoid
Valve for Hot Gas Bypass (SVA)?
Yes
No
Yes
Replace the Solenoid Valve
(SVA) if faulty.
Yes
Activation of Low Compression Ratio Protection Device
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Excessively
Low Compression
Ratio
Check compressor.
Replace comp. if faulty.
Compressor is not Operating
Check inverter.
Repair faulty part.
Inverter is not Functioning
Measure suction pipe
temp. of reversing valve.
Replace reversing valve
if faulty.
Valve Stoppage at Middle
Position of Reversing Valve
Check connector for
PCB1, power source
and pressure indication.
Replace sensor if faulty.
Abnormality of High or Low
Pressure Sensor
Check indoor unit and
outdoor unit air temp.
thermistor.
Replace thermistor
if faulty.
Excessively Low Indoor
Intake Air Temperature
Check Solenoid Valve.
Replace SVA if leaking.
Leakage from Solenoid
Valve (SVA)
PCB1: Control PCB in Outdoor Unit
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