NO
YES
NO
NO
YES
NO
It may need to add external
circulation pump.
Consult installer.
Set on correct value.
YES
YES
NO
Fix it and recharge refrigerant.
Attach wind protection on
outdoor unit.
Charge correct amount of refrigerant
YES
Remove the blockage.
Clean the filter.
YES
NO
YES
Is the water flow rate bigger than
minimum flow rate?
*Go to “No” for alarm 16.
It occurs in case water flow is
insufficient during defrost.
Is the water flow setting done
correctly?
Is the heating circuit clogged
in somewhere else?
Is the particle filter clogged?
Is the outdoor unit;
1）installed where wind blows
into directly
and
2）not equipped with wind
protection?
Is the refrigerant charged
correctly according to piping
length?
Does the refrigerant leak from
somewhere else?
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