Daikin D-Series User Manual

Si18-525B Troubleshooting for BP Unit
Troubleshooting 359
6. Troubleshooting for BP Unit
6.1 Malfunction of Electronic Expansion Valve
Remote
Controller
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
Turn the power supply off once
and then back on.
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
applicable part.
Is malfunction
re-generated?
Is the
resistance of the
electronic expansion
valve coil normal?
(46±4Ω/20˚C)
(Q0390)
NO
YES
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
YES
YES
Is the
electronic
expansion valve coil
connected to PCB
of the faulty
part?
NO

Daikin D-Series Specifications

General

Brand	Daikin
Model	D-Series
Category	Air Conditioner
Language	English