6-9
Note :"Same as normal operation" means that it is same as judgement, countermeasure and check method at
normal operation.
Step Content Alarm
code
Conclusion Possible cause Check method
P22 Check on
discharge gas by-
pass solenoid
valve (BSV)
J221 BSV does not
open.
BSV coil malfunction Check on BSV coil, wiring
and terminals.
P24
Check on defrosting
solenoid valve (DSV)
J241 DSV does not
open.
DSV coil failure Check on DSV coil,
wiring and terminals.
P26 Standard Pull
down operation
No
indication
P28 SMV function
check
(Open SMV to 3%)
J281 (LPT : decrease
20Kpa)
SMV coil failure
SMV malfunction
Refer 4.2.5.
Check appearance
(Replace coil bracket)
P29 Electronic
expansion valve
check
J291 Pump down time
is too long.
Electronic expansion valve
wiring malfunction
Check knocking sound of the
coil Disconnect and connect
the connector of the coil
P30 ISV opening or
closing check
J301 ISV does not
open.
ISV coil malfunction Check on ISV coil, wiring
and terminals.
P32 HSV opening or
closing check
J321 HSV does not
open.
HSV coil malfunction Check on HSV coil,
wiring and terminals.
P50 Pull-down cooling
capacity
J501 Out of ambient
temperature
condition
No unit malfunction
Ambient temperature is lower than -10
˚C
Ambient temperature is higher than 43
˚C
Check ambient
temperature.
P60 0˚C control No
indication
No judgement
P70 Defrosting
operation check
J701 Out of starting
condition. (EOS
is 20˚C or more.)
Wrong installation of EOS.
Check the installation of
EOS.
P90
–18
˚C
control
No
indication
No judgement
P80 Pull-down cooling
capacity
J801 Pull down time is
too long.
Same as normal operation Same as normal
operation
BSV malfunction Check on outlet piping
temperature of BSV
DSV malfunction Check on outlet piping
temperature of DSV
Electronic expansion valve coil
burn out.
Check on knocking
sound of coil.
Leakage of hot gas by-pass
solenoid valve
Touch the outlet pipe of
the solenoid valve.
Leakage of defrosting solenoid
valve
Touch the outlet pipe of
the solenoid valve.
Leakage of discharge gas by-
pass solenoid valve
Touch the outlet pipe of
the solenoid valve.
ISV malfunction
Check on capillary tube
temperature on ISV outlet.
HSV malfunction Check on outlet piping
temperature of HSV
J502 Pull down time is
too long.
Same as normal operation Same as normal
operation
Leakage of hot gas solenoid
valve
Touch the outlet pipe of
the solenoid valve.
J702 Defrost time is
too long.
Wrong installation of EOS.
Check the installation of EOS.
EOS malfunction. Check EOS.
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