(57) An air conditioner (100) comprising a refrigerant circuit (1) including a compressor
(15), a four-way valve (18), an outdoor heat exchanger (19) and an indoor heat exchanger
(26) which are successively connected to one another, plural sensors (SP, ST) containing
refrigerant state detecting sensors (SP, ST11, ST12, ST13, ST21, ST22) for detecting
a state of refrigerant in the refrigerant circuit, the compressor being driven on
the basis of detection values of the respective sensors to perform an air conditioning
operation, and an abnormality determining unit (65) for mutually comparing the detection
values of mutual comparison target sensors of the plural sensors to determine presence
or absence of abnormality of each of the sensors when the refrigerant returns to a
stationary state after the air conditioning operation is stopped.
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