Troubleshooting For Bp Unit; Malfunction Of Electronic Expansion Valve - Daikin E-Series Service Manual

Troubleshooting for BP Unit

6. Troubleshooting for BP Unit

6.1

Malfunction of Electronic Expansion Valve

A9
Remote Control
Display
Method of
Detection by checking continuity and lack of connector.
Malfunction
Detection
Malfunction Malfunction is determined by no common voltage applied when turning the power supply on.
Decision
Conditions
" Faulty harness of electronic expansion valve
Supposed
" Incorrect connectors connection of electronic expansion valve
Causes
Troubleshooting
300
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Turn the power supply off once
and then back on.
Is malfunction
re-generated?
YES
Is the
electronic
expansion valve coil
connected to PCB
of the faulty
part?
YES
Is the
resistance of the
electronic expansion
valve coil normal?
(46±4Ω/20°C)
YES
NO
NO
NO
SiENBE18-621
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.
(Q0390)
Troubleshooting