W'eau WFI-028T - E15 Inlet water temp. sensor failure; E16 Outer piping temp. sensor failure; E18 Exhaust piping temp. sensor failure; E20 Inverter module abnormal protection

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Piping system jammed
Check the piping system
Exhause piping temp. sensor
(Purple connector) detective
Change a new sensor
E15
Inlet water temp. sensor
failure
Sensor disconnected or
defective
Reconnect or replace sensor
E16
Outer piping temp. sensor
failure
Sensor disconnected or
defective
Reconnect or replace sensor
E18
Exhause piping temp.
sensor failure
Sensor disconnected or
defective
Reconnect or replace sensor
E20
Inverter module abnormal
protection
Check the voltage, compressor, fan motor
etc...
E21
Ambient temp. sensor
failure
Sensor disconnected or
defective
Reconnect or replace sensor
E23
Overcooling protection
under cooling mode
Insufficient water flow
Check the water circuit system/ water flow
switch
Outlet water temp. sensor
(Red connector) failure
Change a new sensor
E27
Outlet water temp. sensor
failure
Sensor disconnected or
defective
Reconnect or replace sensor
E29
Suction piping temp. sensor
failure
Sensor disconnected or
defective
Reconnect or replace sensor
E32
Overheating protection
under heating mode
Insufficient water flow
Check the water circuit system/ water flow
switch
Outlet water temp. sensor
(Red connector) failure
Change a new sensor
E33
Piping temp. too high
protection under cooling
mode
Ambient/water temp. is too
high under cooling mode
Check the scope of using
Refrigerant system is
abnormal
Check the piping system
E42
Inner piping temp. sensor
failure
Sensor disconnected or
defective
Reconnect or replace sensor
E46
DC fan motor malfunction
Bad wire connection
Check the wiring of fan motor
Fan motor defective
Change a new fan motor