– 57 –
Check
code
Outdoor
LED display
Check and troubleshooting
(Item without special mention Indicates part of outdoor unit.)

[4-way valve reversal error]

[P19] z

z
z
{
Is operation of 4-way valve
normal?
(Check pipe temp. and etc. in
cooling/heating operation.)
NO
Are temperature sensor normal?
TE sensor: CN603
TS sensor: CN604
NO
YES
YES
NO
YES
Are TC sensor and TCJ
sensor normal?
Check and
replace of PMV
Replace TE sensor.
Replace TS sensor.
Replace coil
of 4-way valve.
Replace TC sensor
Replace TCJ sensor
Is power supply to 4-way
valve coil normal?
Is power supply to
4-way valve coil in heating?
Check outdoor
P.C. board.
Check indoor P.C. board.
Defect → Replace
Check 4-way valve.
Defective → Replace
Check outdoor P.C. board.
Defect → Replace
NO
YES
OK
Error
NO
YES
NO
Is refrigerant flow by
PMV normal?
YES