Outer piping temp. sensor
(White connector) failure
Sensor disconnected or defective
Reconnect or replace sensor
Exhause piping temp. sensor
(Purple connector) failure
Sensor disconnected or defective
Reconnect or replace sensor
Ambient temp. sensor (Black
connector) failure
Sensor disconnected or defective
Reconnect or replace sensor
Difference of outlet and inlet
water temp. too high
Check the water circuit system/ water flow
switch
Outlet water temp. sensor (Red
connector) failure
Inlet water temp. sensor (Blue
connector) failure
Overcooling protection under
cooling mode
Check the water circuit system/ water flow
switch
Outlet water temp. sensor (Red
connector) failure
Outlet water temp. sensor (Red
connector) failure
Sensor disconnected or defective
Reconnect or replace sensor
Suction piping temp. sensor
(Yellow connector) failure
Sensor disconnected or defective
Reconnect or replace sensor
Low ambient temp. protection
Beyond the scope of using temp.
Ambient temp. sensor (Black
connector) failure
Overheating protection under
heating mode
Check the water circuit system/ water flow
switch
Outlet water temp. sensor (Red
connector) failure
Piping temp. too high
protection under cooling mode
Ambient/water temp. is too high
under cooling mode
Refrigerant system is abnormal
Compressor start up failure
Bad wire connection for
compressor
Wrong phase connection for
compressor
Compressor output failure
Wrong phase connection for
compressor
Inner piping temp. sensor
(Green connector) failure
Sensor disconnected or defective
Reconnect or replace sensor
Check the wiring of fan motor
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