Daikin LXE10E-A Service Manual page 149

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Symptom
The low
pressure is
excessively low
The low Solenoid valve
pressure is internal leak(BSV,
excessively DSV, HSV)
high
Solenoid valve
internal leak(ISV)
Faulty compression
by compressor
Cause
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Remove the electronic expansion
valve coil
Blow air into the electronic expansion
valve and heat the valve by a dryer
Is pull-down possible?
Replace the valve
Replace the dryer
Lock-tight
(2) Metal touch
(1) Threads
Normal operation
Is HSV, DSV, BSV
outlet pipe hot?
Is the ISV
outlet pipe hot?
Circuit breaker OFF→ON
Is pull-down possible?
Replace the compressor
6-7
Checkpoint
↓
NO
YES
Restore the electronic expansion valve
(see the pictures below)
(1) Apply Lock-tight sealant to the threads
(2) Apply Lock-tight sealant to the metal touch section
(3) Apply silicone sealant to the flare nut
(4) Fix the cable at two positions
(4) Tie wrap
YES (Hot)
*HSV: Hot gas solenoid valve
DSV: Defrost solenoid valve
BSV: Discharge gas bypass solenoid valve
NO (Cold)
YES (Hot)
*ISV: Injection solenoid valve
NO (Cold)
YES
NO
Remedy
Blow air onto here
Heat here by
a hair dryer
(3) Silicone sealant
Leak from solenoid valve
⇒Replace
Leak from solenoid valve
⇒Replace
Finish