Daikin R407C PLUS, Service Manual

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Troubleshooting Si33-105
162 Troubleshooting R407C PLUS Series Heat Recovery System
3.6 Indoor Unit: Malfunction of Moving Part of Electronic
Expansion Valve (Y1E)
Remote
Controller
Display
A9
Supposed
Causes
!
Malfunction of moving part of electronic expansion valve
!
Defect of indoor unit PC board
!
Defect of connecting cable
Troubleshooting
"
1: Coil check method for the moving part of the electronic expansion valve
Discount the electronic expansion valve from the PC board and check the continuity between
the connector pins.
(Normal)
#
: Continuity
×: No continuity
(VF033)
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 (
H
1)
of the moving part of the
electronic expansion
valve is checked.
The connecting
cable is short-circuited or
disconnected.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Pin No. 1. White 2. Yellow 3. Orange 4. Blue 5. Red 6. Brown
1. White ×
#
Approx.
300
Ω
×
#
Approx.
150
Ω
×
2. Yellow ×
#
Approx.
300
Ω
×
#
Approx.
150
Ω
3. Orange ×
#
Approx.
150
Ω
×
4. Blue ×
#
Approx.
150
Ω
5. Red ×
6. Brown