Toshiba RAV-SM2246AT8J-E Service Manual page 83

Check Outdoor
code LED display
[P19]
(Item without special mention Indicates part of outdoor unit.)
[4-way valve inverse trouble]
Does 4-way valve
work correctly?
NO
(Check pipe temp. etc.
in cooling/heating
operation.)
YES
Temperature
NO
sensor normal?
TE sensor CN601
TS sensor CN600
YES
Is the flow of the
NO
refrigerant by the
PMV normal?
YES
NO
Indoor TC, TCJ
sensor normal?
YES
[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) Push 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-way valve resistance
value relay operation
: Go OFF : Go ON
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 and troubleshooting
resistance
value of 4-way
valve normal?
The voltage
Replace
variation due to
TE, TS sensor
the confirmation
of 4-way valve
relay operation,
refer to below?
Check PMV
and replace
Check Interface
(CDB) P.C.board
Replace
TC, TCJ sensor
Check indoor P.C.board
Failure → Replace
D800 D801 D802
: Flash (5 times/sec)
– 83 –
Is the coil
NO
4-way valve coil
YES
NG
Check 4-way valve.
Defec R Replace
NO
OK
D803 D804
Replace