Daikin VRV III RXYQ5-54PY1, Service Manual

Page: 238 / 398

Si34-601A Troubleshooting by Indication on the Remote Controller
Troubleshooting 227
3.6
“
A9
”
Indoor Unit: Malfunction of Moving Part of Electronic
Expansion Valve (Y1E)
Remote
Controller
Display
A9
Applicable
Models All indoor unit models
Method of
Malfunction
Detection Use a microcomputer to check the electronic expansion valve for coil conditions.
Malfunction
Decision
Conditions When the pin input of the electronic expansion valve is not normal while in the initialization of
the microcomputer.
Supposed
Causes
„
Malfunction of moving part of electronic expansion valve
„
Defect of indoor unit PC board
„
Defect of connecting cable
Troubleshooting
(V2781)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
After connecting, turn the power
supply off and then back on.
Replace the moving part of the
electronic expansion valve.
YES
YES
NO
NO
Replace the connecting cable.
If you turn the power supply off
and turn on again, and it still does
not help, replace the indoor unit
PC board.
NO
YES
The
electronic
expansion valve is
connected to X7A of the
indoor unit PC
board.
Normal
when coil check
(
∗
1) of the moving part of
the electronic expansion
valve is
checked.
The connecting
cable is short-circuited or
disconnected.