Daikin LXE10E-A Service Manual page 150

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Symptom
The high
pressure is
excessively low
Faulty operation of
The discharge
valve
gas temperature
(HSV or DSV)
is low
The low
pressure is
excessively high
Faulty operation of
high pressure
transducer HPT
(charging is
impossible)
Faulty operation of low
pressure transducer
LPT (charging is
impossible)
Displacement of
HPT, DCHS
(Stop of evaporator
fan)
Stop of evaporator
fan
Reduced heating air
volume
(stop or drop of
evaporator fan)
Pressure leak to
condenser due to leak
from discharge pressure
control valve (DPR)
Leak from ISV⇒
Charge control is
unavailable
Cause
Heating operation
Is the outlet piping of HSV,
Is the difference in pressure
between the pressure gauge and
HPT 100 kPa or more?
Is the difference in pressure
between the pressure gauge
and LPT 30 kPa or more?
Is the DCHS or heat
insulator installed
inappropriately?
Is the magnetic
contactor (high speed) for
evaporator fan motor
Is the evaporator fan motor
HPT＜700kPa ?
Leak from ISV
⇒Replace the ISV
6-8
Checkpoint
YES
DSV cold?
NO
YES
NO
YES
NO
YES
※ DCHS: Discharge pipe temperature sensor
NO
YES
turned OFF?
NO
YES
stopped?
NO
YES
NO
Remedy
Faulty operation of HSV,
DSV⇒Replace
Faulty HPT
⇒Replace
Faulty LPT
⇒Replace
Correct installation of
DCHS
Faulty DCHS temperature
detection
⇒Replace
Faulty motor
⇒Replace
Leak from DPR
⇒Replace the DPR