Troubleshooting by Indication on the Remote Controller
SiUS28-902_B
96
Service Diagnosis
3.6
Electronic Expansion Valve Coil Abnormality
Remote
Controller
Display
A9
Applicable
Models
FCQ, FHQ, FAQ, FTQ
Method of Error
Detection
Check the coil condition of electronic expansion valve by using micro-computer.
Error Decision
Conditions
Pin input for electronic expansion valve coil is abnormal when initializing micro-computer.
Supposed
Causes
Defective electronic expansion valve coil
Defective indoor unit PCB
Defective connecting cable
Troubleshooting
The
electronic expansion
v
al
v
e is connected to X7A of
the indoor
u
nit PCB.
N
ormal
w
hen coil check
(
*
1) of the electronic
expansion
v
al
v
e coil is
checked.
The
connecting ca
b
le
is short circ
u
ited or
disconnected.
Be s
u
re to t
u
rn off the po
w
er s
w
itch
b
efore connecting or disconnecting
the connector or parts may
b
e damaged.
Caution
After connecting, t
u
rn the po
w
er
s
u
pply OFF and then
b
ack O
N
.
Replace the electronic expansion
v
al
v
e coil.
Replace the connecting ca
b
le.
If yo
u
t
u
rn the po
w
er s
u
pply OFF
and t
u
rn O
N
again, and it still does
not help, replace the indoor
u
nit
PCB.
N
O
YES
N
O
YES
YES
N
O
