79
[P19]
[4-way valve inverse trouble]
[4-way valve relay operation check]
Service switches SW01 and SW02 can be used to check the operation of the
4-way valve relay.
Use to check whether there are any problems with the 4-way valve or 4-way
valve coil.
[Method of operation]
1) Ensure that D800 to D804 are off (or rapidly flashing) and that D805 is lit up. If D800 to D804 are
slowly flashing or D805 is flashing then push and hold down SW01 and SW02 at the same time
for at least 5 seconds.
D800 to D804 will turn off (or rapidly flash) and D805 turn on.
2) Push and hold down SW01 for at least 5 seconds. D804 will start slowly flashing.
3) Push SW01 until reaching the below [4-way valve resistance value relay operation] LED
indication.
4) Push SW02 until D805 starts rapidly flashing.
5) Push and hold down SW02 for at least 5 seconds. D804 will start slowly flashing, D805 will turn
on, and the 4-way valve resistance value relay operation will turn on.
6) Push and hold down SW01 and SW02 at the same time for at least 5 seconds or wait 2 minutes
to return to normal control.
Check
code
Outdoor LED
indication
Check and troubleshooting
(Item without special mention indicates part of outdoor unit.)
Does 4-way valve
work correctly?
(Check pipe temp. etc.
in cooling / heating
operation.)
Is the coil
resistance
value of 4-way
valve normal?
Indoor TC, TCJ
sensor normal?
Check outdoor
P.C. board
Replace
TE, TS sensor
Check PMV
and replace
Replace
TC, TCJ sensor
NO
NO
NO
Replace
4-way valve coil
NO
NO
Check 4-way valve
and replace
NO
YES
YES
NO
OK
Temperature
sensor normal?
TE sensor
GP56: CN600,
GP80: CN601
TS sensor
GP56: CN603,
GP80: CN600
The voltage
variation due to
the confirmation
of 4-way valve
relay operation,
refer to below?
Is the flow of the
refrigerant by the
PMV normal?
YES
YES
YES
Replace indoor P.C. board
: Go OFF,
: Go ON,
: Flash (5 times/sec.)
4-way valve resistance value
relay operation
D800
D801
D802
D803
D804