24
5.3 Failure code table overview
Protection Failure
/
Control
Display
P7
E1
E8
Check
Solution
P1
1. Check the connection of inlet water
sensor.
2. Check if the sensor is broken.
1. Reconnect the sensor.
2. Replace the sensor.
P2
1. Check the connection of outlet water
sensor.
2. Check if the sensor is broken.
1. Reconnect the sensor.
2. Replace the sensor.
P3
1. Check the connection of coil
temperature sensor.
2. Check if the sensor is broken.
1. Reconnect the sensor.
2. Replace the sensor.
P5
1. Check the connection of ambient
temperature sensor.
2. Check if the sensor is broken.
1. Reconnect the sensor.
2. Replace the sensor.
E14
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.
E3
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.
Check the connection
Reconnect the connection wire.
P7
No action required
No action required
Winter anti-freeze protection
Ⅰ
Water flow switch failure
Protection for excessive temp.
difference between water inlet & outlet
Ambient temp. sensor failure
Coil temp. sensor failure
Outlet water temp. sensor failure
Inlet water temp. sensor failure
Communication failure
High pressure protection
Winter anti-freeze protection
Ⅱ
E4
Order of phases incorrect
(only for 3 phase model)
Order of phases incorrect
Reconnect the phases in right order.
E2
1. Check if high pressure switch is broken.
2. Check if there is a blockage in water
circuit or water flow is not enough.
3. Check if there is a blockage in refrigerant
circuit.
1. Replace high pressure switch.
2. Remove cause of blockage or
increase water flow.
3. Send heat pump to dealer for detailed
check.
1. Check if low pressure switch is broken.
2. Check if refrigerant level is low.
3. Ambient temp. and water inlet
temp. is too low.
1. Replace low pressure switch.
2. Fill up with enough refrigerant.
3. Decrease water flow.
4. Send heat pump to dealer for
detailed check.
Low pressure protection
Water Out Over-Heated
1. Check if there is any jam in the water circuit.
2. Check if the water flow volume is enough.
3. Check if the water pump has failed to work.
1. Remove the jam.
2. Increase the water flow volume.
3. Repair or replace the water pump.
E12
E13
Water Out Over-Cooled
P4
1. Check the connection of return gas
temperature sensor.
2. Check if the sensor is broken.
1. Reconnect the sensor.
2. Replace the sensor.
Return gas temp. sensor failure
