Daikin FTKS50BVMB, Service Manual

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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
(Q0 3 90)
NO
YE S
NO
Caution
YE S
YE S
NO
Be su re to t u rn off power s witch b efore connect or di s connect connector,
or p a rt s d a m a ge m a y b e occ u rred.
T u rn the power su pply off once
a nd then ba ck on.
I s m a lf u nction
re-gener a ted?
I s the
electronic
exp a n s ion v a lve coil
connected to PCB
of the f au lty
p a rt?
I s the
re s i s t a nce of the
electronic
exp a n s ion v a lve coil
norm a l?
(46±4
Ω
/20°C)
Keep us ing as it i s . (Co u ld
b e o u t s ide error other th a n
m a lf u nction.)
Correct the connection.
Electronic exp a n s ion
v a lve coil f au lty
Repl a ce BP u nit PCB of
the a pplic ab le p a rt.