1
2
16. Overview of failure code on Display (LED controller)
Wire
controller
Protection/Failure
Check
Solution
PP01/PP1
Inlet water temp. sensor
failure
1. Check the connection of inlet
water sensor.
2. Check if the sensor is broken.
1. Reconnect the sensor.
2. Replace the sensor.
PP02/PP2
Outlet water temp. sensor
failure
1. Check the connection of outlet
water sensor.
2. Check if the sensor is broken.
1. Reconnect the sensor.
2. Replace the sensor.
PP03/PP3
Coil 1 temp. sensor failure
1. Check the connection of coil 1
temperature sensor.
2. Check if the sensor is broken.
1. Reconnect the sensor.
2. Replace the sensor.
PP04/PP4
Coil 2 temp. sensor failure
1. Check the connection of coil 2
temperature sensor. temperature
2. Check if the sensor is broken.
1. Reconnect the sensor.
2. Replace the sensor.
PP05/PP5
Ambient temp. sensor failure
1. Check the connection of ambient
temperature sensor.
2. Check if the sensor is broken.
1. Reconnect the sensor.
2. Replace the sensor.
PP06/PP6
Protection for excessive temp.
difference between water inlet
& outlet
1. Check if there is any blockage in
the water circuit.
2. Check if the water flow volume is
enough.
3. Check if the water pump is
working.
1. Remove the cause of
the blockage.
2. Increase the water flow
volume.
3. Repair or replace the
water pump.
PP07/PP7
Anti-freeze protection for
cooling
Refer to PP06.
Refer to PP06.
PP07/PP7
Winter anti-freeze protection
Ⅰ
No action required
PP07/PP7
Winter anti-freeze protection
Ⅱ
No action required
EE03/EE3
Water flow switch failure
1. Check if wiring connection of flow
switch is in correct position.
2. Check water flow.
3. Check if flow switch is broken.
4. Check if water pump is working.
1. Reconnect the wiring.
2. Increase water flow.
3. Replace flow switch.
4. Repair or replace water
pump.
EE04/EE4
Order of phases incorrect
(only for 3 phase model)
Order of phases incorrect
Reconnect the phases in
right order.
EE01/EE1
EE06/EE6
High / Low pressure
protection
1. Check if high or low pressure
switch is broken.
2. Check if lack refrigerant level is
low (for low pressure).
3. Ambient temp. and water inlet
temp. is too low (for low pressure).
4. Check if there is a blockage in
water circuit or if water flow is not
enough (for high pressure).
5. Check if there is a blockage in
refrigerant circuit (for high
pressure).
1. Replace pressure
switch.
2. Fill up with enough
refrigerant.
3. Decrease water flow.
4. Remove cause of
blockage or increase
water flow.
5. Send heat pump to
dealer for detailed
check.
EE05/EE5
Failure of excessive temp.
difference protection between
water inlet & outlet
1. Check if there is enough water
flow volume.
2. Check if inlet / outlet water temp.
sensor is working.
1. Increase water flow.
2. Replace sensor.
No
display
Defrosting
EE08/EE8
Communication failure
Check the connection
Reconnect the connection
wire.
