Cooling/Heating Conversion Is Disable; Heating Operation On By Remocon - Hyundai HSH-I073NBE Service Manual

3.7 Cooling/heating conversion is disable.

Air Conditioner Service Manual

Heating operation ON by remocon

If the reversing valve (4-way valve) is ON, "tick" sounds.
Connector check
4-way valve connection check
outdoor unit connecting wire
check
PCB ass'y check
4-way valve relay output = ON
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.
4-way valve coil resistance check
80