Si18-525B Troubleshooting for Outdoor Unit
Troubleshooting 371
7.6 Malfunction of Moving Part of Electronic Expansion
Valve
Remote
Controller
Display
E9
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
Check disconnection of connector
Check continuity of expansion valve coil
Malfunction
Decision
Conditions
Error is generated under no common power supply when the power is on.
Supposed
Causes
Defect of moving part of electronic expansion valve
Defect of outdoor unit PCB (A1P)
Troubleshooting
∗
1 Coil check method for the moving part of the electronic expansion valve
Disconnect the electronic expansion valve from the PCB and check the continuity between the
connector pins.
Normal condition
: Continuity Approx. 300
Ω,
: Continuity Approx. 150
Ω,
×: No continuity
(Q0426)
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Return to normal?
Turn power supply off, and
turn power supply on again.
Electronic
expansion valve is
connected to X26A and
X28A of outdoor unit
PCB
(A1P).
Normal
when coil
check (∗1) of the moving
part of the electronic
expansion valve is
checked.
Replace outdoor unit PCB A1P.
NO
NO
NO
Replace the moving part of the
electronic expansion valve.
External factor other than
malfunction (for example, noise
etc.).
After connecting, turn the power
off and then back on again.
YES
YES
Pin No. 1. White 2. Yellow 3. Orange 4. Blue 5. Red 6. Brown
1. White × × ×
2. Yellow × ×
3. Orange × ×
4. Blue ×
5. Red ×
6. Brown
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