Daikin Super Multi Plus E-Series - Troubleshooting for BP Unit; Malfunction of Electronic Expansion Valve

Troubleshooting for BP Unit SiEN18-622
352 Troubleshooting
6. Troubleshooting for BP Unit
6.1 Malfunction of Electronic Expansion Valve
Remote Control
Display
A9
Method of
Malfunction
Detection
Detection by checking continuity and lack of connector.
Malfunction
Decision
Conditions
Malfunction is determined by no common voltage applied when turning the power supply on.
Supposed
Causes
 Faulty harness of electronic expansion valve
 Incorrect connectors connection of electronic expansion valve
Troubleshooting
(Q0390)
NO
YES
NO
Caution
YES
YES
NO
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Turn the power supply off once
and then back on.
Is malfunction
re-generated?
Is the
electronic
expansion valve coil
connected to PCB
of the faulty
part?
Is the
resistance of the
electronic
expansion valve coil
normal?
(46±4Ω/20°C)
Keep using as it is. (Could
be outside error other than
malfunction.)
Correct the connection.
Electronic expansion
valve coil faulty
Replace BP unit PCB of
the a
pplicable part.