Daikin LX10F11B3 Service Manual page 79

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Symptom
The low pressure is
too high.
Refrigerant
overcharge.
Solenoid valve
internal leak
HSV,RSV (PRV)
The high pressure is
excessively low.
The discharge gas
Faulty operation of
temperature is low.
solenoid valve (HSV)
The low pressure is
excessively high.
HPT failure
(pressure reading is
not correct)
LPT failure
(pressure reading is
not correct)
DCHS1, 2 installation
faulty
Pressure leak to
condenser due to
leak from DMV
Cause
Normal operation
Automatic
pomp-down
Is E202 generated？
Is high pressure high?
Is outlet side pipe
of HSV,RSV, (PRV)
Compressor compression fault
Heating operation
Is the outlet
piping of HSV
Is the difference
in pressure between the pressure
gauge and HPT 100 kPa
Is the difference
in pressure between the pressure
gauge and LPT 30 kPa
Is the DCHS1, 2
or heat insulation installed
improperly ?
HPT＜400kPa ?
Shortage of refrigerant or
outside air temperature is too low.
2-50
Checkpoint
YES（E202）
NO
YES (High)
NO
YES (Hot)
hot?
NO
YES
cold?
NO
YES
or more?
NO
YES
or more?
NO
YES
※ DCHS: Discharge pipe
temperature sensor
NO
YES
NO
Remedy
Refrigerant recovery,
Recharging
To page 2-47 and 48
（The high pressure is
excessively high.）
Leak in solenoid valve
⇒ Replace
Faulty operation of
HSV
⇒ Replace
Faulty HPT
⇒ Replace
Faulty LPT
⇒ Replace
Correct installation
of DCHS
Leak in DMV
⇒ Replace