Failure Code Table Overview - welldana WMV Instruction Manual

5.3 Failure code table overview

Control
Protection Failure
Display
P1 Inlet water temp. sensor failure
Outlet water temp. sensor failure
P2
P3 Coil temp. sensor failure
P4
Return gas temp. sensor failure
P5
Ambient temp. sensor failure
Winter anti-freeze protection Ⅰ
P7
Winter anti-freeze protection Ⅱ
P7
E1
High pressure protection
E2 Low pressure protection
E3
Water flow switch failure
Order of phases incorrect
E4
(only for 3 phase model)
E8
Communication failure
Water Out Over-Cooled
E12
E13 Water Out Over-Heated
Protection for excessive temp.
E14
difference between water inlet & outlet
/
1. Check the connection of inlet water
sensor.
2. Check if the sensor is broken.
1. Check the connection of outlet water
sensor.
2. Check if the sensor is broken.
1. Check the connection of coil
temperature sensor.
2. Check if the sensor is broken.
1. Check the connection of return gas
temperature sensor.
2. Check if the sensor is broken.
1. Check the connection of ambient
temperature sensor.
2. Check if the sensor is broken.
No action required
No action required
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. 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.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.
Order of phases incorrect
Check the connection
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. 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.
Check
24
Solution
1. Reconnect the sensor.
2. Replace the sensor.
1. Reconnect the sensor.
2. Replace the sensor.
1. Reconnect the sensor.
2. Replace the sensor.
1. Reconnect the sensor.
2. Replace the sensor.
1. Reconnect the sensor.
2. Replace the sensor.
1. Replace high pressure switch.
2. Remove cause of blockage or
increase water flow.
3. Send heat pump to dealer for detailed
check.
1. Replace low pressure switch.
2. Fill up with enough refrigerant.
3. Decrease water flow.
4. Send heat pump to dealer for
detailed check.
1.Reconnect the wiring.
2.Increase water flow.
3.Replace flow switch.
4.Repair or replace water pump.
Reconnect the phases in right order.
Reconnect the connection wire.
1. Remove the jam.
2. Increase the water flow volume.
3. Repair or replace the water pump.
1. Remove the cause of the blockage.
2. Increase the water flow volume.
3. Repair or replace the water pump.