IVT 12PHR-N Service Manual page 39

Status of Indication
indoor/ by LED1
outdoor on
units outdoor
unit*2
Indoor/
6 times
outdoor
units in
complete
shutdown
Indoor/
7 times
outdoor
units in
complete
shutdown
12PHR-N_S530612PHRN.indd 15
Malfunction No.
displayed on main unit
display section *1
Main Sub-
category category category
6 -0 Outdoor unit
DC
-1
7 -0 Outdoor unit
AC
-1
-2
-3
Content of diagnosis
Main Sub-category
DC over current (1) IPM continuity
check
error
(2) Check the IPM and
heat sink for secure
installation.
(3) Check the outdoor
unit fan motor for
proper rotation.
(4) No abnormality
found in above
inspections (1) through
(3).
(5) No abnormality
found in above
inspections (1) through
(4).
IPM pin level error Check the IPM is
attached correctly
to the outdoor unit
control PWB.
AC over current (1) Check the outdoor
unit air outlet for
error
blockage
(2) Check the outdoor
unit fan for proper
rotation.
AC over current (1) IPM continuity
check
error in OFF status
AC maximum (1) Check the outdoor
unit air outlet for
current error
blockage.
(2) Check the outdoor
unit fan for proper
rotation.
AC current (1) Check if there is
deficiency error
an opencircuit in the
secondary winding of
the current transformer
of the outdoor unit
control PWB.
(2) Check if the
refrigerant volume is
abnormally low.
(3) Check if the
refrigerant flows
properly.
3-15
Inspection Remedy
location/method
(1) Replace the
outdoor unit control
PWB assembly.
(2) Correct the
installation (tighten the
screws).
(3) Replace the
outdoor unit fan motor.
(4) Replace the
outdoor unit control
PWB assembly.
(5) Replace the
compressor.
Replace the outdoor
unit control PWB
assembly.
(1) Ensure
unobstructed air flow
from the outdoor unit
air outlet.
(2) Check the outdoor
unit fan motor.
(1) Replace the
outdoor unit control
PWB assembly.
(1) Ensure
unobstructed air flow
from the outdoor unit
air outlet.
(1) Check the outdoor
unit fan motor.
(1) Replace the
outdoor unit control
PWB assembly.
(2) Charge the
specified amount of
refrigerant.
(3) Correct refrigerant
clogs. (2-way valve,
3-way valve, pipe,
expansion valve)
12PHR-N
2013/8/7 15:42:17