6-20
Note :"Same as normal operation" means that it is same as judgement, countermeasure and check method at
normal operation. (Refer to Page 6-1~6-9)
Step Content Alarm
code
Judgement Possible cause Check method
P22
Check on discharge
gas by-pass solenoid
valve (BSV)
(BSV : ON)
J221 BSV does not
open.
(LPT : increase
10Kpa)
BSV coil malfunction Check on BSV coil,
wiring and terminals.
P24 Check on
defrosting solenoid
valve (DSV)
(DSV : ON)
J241 DSV does not
open.
(HPT : decrease
40Kpa)
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 : increase
10Kpa)
SMV coil failure
SMV malfunction
Refer 4.2.5.
Check appearance
(Replace coil bracket)
P29 Electronic
expansion valve
check
(Open EV to 5% )
J291 Pump down time
is too long.
(It should be
LP < –55Kpa
within 2 minutes)
Electronic expansion valve
wiring malfunction
(Coil mounting failure)
Check knocking sound of the
coil Disconnect and connect
the connector of the coil
Refer to 4.2.4 mounting
P30 ISV check
(ISV : ON)
J301 ISV does not
open.
(SGS drops 3°C)
ISV coil malfunction Check on ISV coil, wiring
and terminals.
P32 HSV check
(HSV : ON)
J321 HSV does not
open.
(HPT decrease
40Kpa)
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.
(It should be RS <
–18°C within 3 hours.)
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.
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.
(SS temperature
should drop to 1°C
within 2 hours)
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.
(It should be EOS >
30°C within 90 minutes)
Wrong installation of EOS. Check the installation of
EOS.
EOS malfunction. Check EOS.
P20
Check on
economizer solenoid
valve (ESV)
(ESV : ON)
J201 ESV does not
open.
(HPT > 20Kpa)
ESV coil malfunction Check on ESV coil,
wiring and terminals.
ESV malfunction
Check on capillary tube
temperature on ESV outlet.
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