Hisense 2AMW-42U4RRA, Technical & Service Manual, Page: 53 / 80

12. CONTROL MODE
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b. Mode conflict
The operating mode of outdoor unit is decided by the operating mode of the indoor unit firstly
booted. Indoor unit subsequently booted will firstly determine whether it’s own mode is conflict
with the outdoor mode. If so, the indoor unit will automatically shut down after three beeps; If
there is no conflict, the indoor unit will boot normally. The relationship of mode conflict is as
follows:
Driven choice
Active mode
Cooling Dehumidification Heating fan
Cooling
√ √
×
√
Dehumidification √ √ × √
Heating × × √ ×
Fan
√
√
× √
√―――Mode conflict will not happen
×―――Mode conflict will happen
7) Outdoor four-way Valve Control
Four-way valve of the outdoor machine shuts down when cooling but starts when heating.
The operation of heating defrosting refers to defrosting operation and, when the heating remote
shutdown, the four-way valve disconnects in 50s when the compressor stops working.
8) Start-up Protection
To prevent compressor from restart frequently in the condition that system pressure has not been
completely balanced, it can’t be restarted within 3 minutes.
9) Pressure Protection
Pressure switch is normally kept open. When the pressure grows too high, the pressure switch
will close and soft will enter pressure protection control. soft will automatically decrease the
frequency. If the pressure is still unable to return to normal condition after decreasing frequency,
compressor will stop and report the fault code of pressure protection.