Heating operation ON by remocon
4-way valve connection check
outdoor unit connecting wire
check
Switchover into cooling operation by remocon,
and after about 30 sec., check the 4-way valve
relay output = 4-way valve OFF
If 4-way valve is OFF, the refrigerant flowing sounds
(pee....) due to cycle switchover occurs.
If the reversing valve (4-way valve) is ON, "tick" sounds.
Connector check
PCB ass'y check
4-way valve coil resistance check
4-way valve relay output = ON
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