Daikin VRV III REYQ8PY1 Service Manual page 278

Si37-701
Troubleshooting
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Turn OFF the power supply
once and then ON again.
Does the
power supply normally
come back ON?
While in monitor mode, identify an electronic expansion valve
subject to the Malfunction Code "
refer to information on P226~227.)
When Check 4 is set as shown below:
Check 3 Check 4
connector for the
electronic expansion valve of the PC
board concerned properly
connected?
Is the
resistance of
the electronic expansion
valve coil normal?
(See *1)
*1: Procedure for checking the electronic expansion valve for
the drive unit coil.
Disconnect the electronic expansion valve connector (X7A)
from the PC board, and then make measurement of
resistance and check for continuity between the connector
pins to make judgment.
White (1)
φ1
[COM] Red (5)
φ3
Orange (3)
The normal states are as follows:
No continuity between Pins (1) and (2)
Approx. 300Ω resistance between Pins (1) and (3)
Approx. 150Ω resistance between Pins (1) and (5)
Approx. 300Ω resistance between Pins (2) and (4)
Approx. 150Ω resistance between Pins (2) and (6)
Troubleshooting by Indication on the Remote Controller
YES
NO
F9
". (For checking procedure,
→ Electronic expansion valve (Y4E)
→ Electronic expansion valve (Y5E)
→ Electronic expansion valve (Y2E)
→ Electronic expansion valve (Y3E)
→ Electronic expansion valve (Y1E)
Is the
NO
YES
NO
YES
(1) White
(2) Yellow
M
(3) Orange
(4) Blue
φ2 φ4
(5) Red
Yellow Brown Blue
(2) (6) (4)
(6) Brown
[COM]
Probe any external causes
other than failures (e.g.
noises).
Properly and securely
connect the connector.
Replace the electronic
expansion valve coil
concerned.
Replace the BS unit PC
board.
267