Daikin ERQ - 3.13 “CC” AHU: Malfunction of Humidity Sensor System

ESIE09-05 Troubleshooting by Indication on the Remote Controller
Troubleshooting 169
3.5 “A9” AHU: Malfunction of Moving Part of Electronic
Expansion Valve (Y1E)
Remote
Controller
Display
A9
Applicable
Models
All AHU models
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
 Malfunction of moving part of electronic expansion valve
 Defect of AHU 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 AHU PC
board.
NO
YES
The
electronic
expansion valve is
connected to X7A of the
AHU 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.
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