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[P19] [4-way valve reversal trouble]
Check code
Outdoor LED
indication
Check and Action procedure
(No specific description indicates outdoor unit parts.)
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?
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
If defective, replace it
NO
YES
YES
YES
NO
Temperature
sensor normal?
TE sensor
TS sensor
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
[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) Confirm 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 [Self-preservation valve operation].
4) Push SW02until 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 will be operated.
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 indoor PC board
Failure → Replace
D800
Self-preservation valve suck operation
(Heating)
D801 D802 D803 D804
D800
Self-preservation valve secession operation
(Cooling)
D801 D802 D803 D804
Check outdoor
control board
If defective,
replace it
PC board
<401, 601> MCC-1768
<801, 1101> MCC-1675
: Off : Light : Flash (5 times/sec)
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