Daikin LX10F10A, Service Manual

Page: 75 / 126

Symptom Cause Checkpoint Remedy
Ⅲ
Inside temper
ature does not drop
.
The low pressure is
excessively low.
Refrigerant
overcharge.
Compressor compression fault
Refrigerant recovery,
Recharging
Is outlet side pipe
of HSV,RSV,PCV
hot?
Leak in solenoid valve
⇒ Replace
Normal operation
Automatic
pomp-down
Is E202 generated ？
Is high pressure high?
To page 2-47 and 48
（ The high pressure is
excessively high. ）
YES （ E202 ）
YES (High)
YES (Hot)
NO
NO
NO
Solenoid valve
internal leak
HSV,RSV and PCV
Ⅳ
Inside temper
ature does not r
ise (dur
ing heating oper
ation).
The high pressure is
excessively low.
The discharge gas
temperature is low.
The low pressure is
excessively high.
Faulty operation of
solenoid valve (HSV)
YES
YES
Is the outlet
piping of HSV
cold?
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 insulation installed
inappropriately?
Faulty operation of
HSV
⇒ Replace
Faulty HPT
⇒ Replace
NO
NO
YES
Faulty LPT
⇒ Replace
NO
NO
YES
Correct installation
of DCHS
NO
HPT ＜ 400kPa ?
YES
Leak in DMV
Refrigerant shortage
Ambient temperature is low
Heating operation
※ DCHS: Discharge pipe
temperature sensor
Faulty operation of high
pressure transducer
HPT (Charging is
impossible.)
Faulty operation
of low pressure
transducer LPT
(Charging is
impossible.)
Pressure leak to
condenser due to
leak from DMV
2-50