YES
YES
Correct it.
NO
NO
NO
Are the service valves fully open?
Is the connecton of the sensor
for indoor heat exchanger
temperature (BT15) or for inlet
water temperature (BT3) OK?
Are the characteristics of the
sensor for indoor heat exchanger
temperature (BT15) or for inlet
water temperature (BT3) OK?
YES
NO
Is the low pressure normal during
operation?
YES
Defective control PCB→replace.
Top up refrigerant.
Defective the sensors for
indoor heat exchanger
temperature or inlet water
temperature→replace.
Open the service valves.
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