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Symptom
The control
temperature is
unstable.
Faulty low
pressure
transducer LPT
Faulty discharge
pipe temperature
sensor DCHS 1, 2
Pipe temperature
sensor fault
（EOS,EIS,SGS）
Air temperature
sensor fault （RS,SS）
Temperature
continues to
decrease.
Stop of evaporator
fan
Temperature
continues to
increase.
・ Solenoid valve
HSV or RSV
internal leak
Excessive frost on
the evaporator
Cause
Operating temperature
is fluctuating.
Is the difference
in pressure between the pressure
gauge and LPT 30 kPa
or more?
Is the DCHS 1, 2
or heat insulation installed
improperly ?
Improper installation
of EOS, EIS
and SGS?
Installation check of RS and SS
Temperature continues
to decrease.
Condenser fan stop
Check the SS and RS.
Temperature continues
to increase.
Is outlet side
pipe of HSV or
DSV hot?
Manual defrost
2-51
Checkpoint
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Remedy
Replace the LPT.
Correct
installation
of DCHS
Repair
Installation
of EOS,EIS
and SGS
Check the fan
motor.
Check operation of the
HSV, RSV.
⇒ Replace the HSV,
RSV.
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