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TROUBLESHOOTING
“RUN” light flickers and “ALARM” is indicated on the remote control switch.
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 display of the outdoor unit PCB.
This alarm code is indicated when a compression ratio,
ε
=
{
(Pd + 0.1) / (Ps + 0.1)
}
is calculated from
a discharge pressure (MPa) and suction pressure (MPa) and the condition lower than
ε
= 1.8 occurs more than 3 times including 3 in one hour.
Alarm
Code
Does the inverter operate?
Yes
Does the compressor operate?
Is the four-way valve spindle
mounted at middle position?
Are the high-pressure sensor and
the low-pressure sensor good?
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 four-way 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
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 4-way valve.
Replace 4-way valve
if faulty.
Valve Stoppage at Medium
Position of 4-Way Valve
Check connector for
PCB, 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.
<FX Series Only>
Replace SVA if leaking.
Leakage from Solenoid
Valve: SVA Outdoor Unit
Check Solenoid Valve.
Replace SVD1 and
SVS1 if leaking.
Leakage from Solenoid
Valve: SVD1, SVS1 of
CH Unit
Activation to Protect System from Low Compression Ratio
