Toshiba HWS-P805XWHM3-E(TR) Service Manual page 123

Outdoor LED
Check code
indication
[P19]
<Model B>
(No specific description indicates outdoor unit parts.)
[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 SW800 and SW801 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 SW800 and SW801 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 SW800 for at least 5 seconds. D804 will start slowly flashing.
3) Push SW800 until reaching the below [4-way valve resistance value relay
operation] LED indication.
4-way valve resistance
value relay operation
: Off : Light
4) Push SW801until D805 starts rapidly flashing.
5) Push and hold down SW801 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 SW800 and SW801 at the same time for at least 5 seconds
or wait 2 minutes to return to normal control.
122
Check and Action procedure
Is the coil
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)
NO
Replace
4-way valve coil
YES
NG
Check 4-way valve.
Defec R Replace
NO
OK
D803 D804