W'eau WMI-004 - Troubleshooting

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6. Trouble shooting
6.1 Error code on the LED controller
Code
Description
Reason
Solutions
E03
Water flow failure
1. Insufficient or no water flow.
2. The wiring for water flow
switch is in loose situation.
1. Check the water pump or water piping system.
2. Check the wiring or change a new water flow
switch.
E04
Freezing protection
Low ambient temp.
It's a protection for the system.
E09
Communication failure
1. Bad connection.
2. Controller or PCB broken.
1. Check the wiring between PCB and controller.
2. Change a new controller or PCB.
E10
Communication failure
1. Bad connection.
2. Controller or PCB broken.
1. Check the wiring between driver board and
controller.
2. Change a new controller or driver board.
E12
High exhaust temp.
protection
Insufficient gas in the system.
Check if there is gas leakage in piping system
E15
Inlet temp. sensor failure
Temp. sensor open circuit or
short circuit.
1. Check the sensor wiring.
2. Replace the new temp. sensor.
E16
Piping temp. sensor failure
Temp. sensor open circuit or
short circuit.
1. Check the sensor wiring.
2. Replace the new temp. sensor.
E18
Exhaust temp. sensor
failure
Temp. sensor open circuit or
short circuit.
1. Check the sensor wiring.
2. Replace the new temp. sensor.
E20
Abnormal inverter module
failure
Check the running situation of
heat pump.
It's a protection for the system.
E21
Ambient temp. sensor
failure
Temp. sensor open circuit or
short circuit.
1. Check the sensor wiring.
2. Replace the new temp. sensor.
E23
Outlet water temp. too low
under cooling mode
Insufficient water flow.
Check the water pump or water piping system
E27
Outlet temp. sensor failure
Temp. sensor open circuit or
short circuit.
1. Check the sensor wiring.
2. Replace the new temp. sensor.
E32
Outlet water temp. too
high under heating mode
Insufficient water flow.
Check the water pump or water piping system
E46
DC fan motor failure
1. Bad connection.
2. Fan motor broken.
1. Check the wiring of fan motor.
2. Change a new fan motor.