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8. Troubleshooting
8.1 system protection/ error indication
error code
error description
Solutions
Er 03
water flux failure
Check water flow /switch
Er 04
winter anti-freezing
Water pump will run automatically for first grade
antifreeze
Er 05
high pressure failure
1. Discharge redundant refrigerant from heat pump
gas system
2.Clean the water exchanger or water filter
Er 06
low pressure failure
1.Check if there is any gas leakage, re-fill the
refrigerant
2.Replace the filter or capillary
Er 09
communication
failure
between
Display and PCB
1. Check if the communication connection wire
between display and PCB is disconnected or has
poor contact. Change the wire or mend it if yes.
2. Check if PCB or display is damaged. Change the
corresponding part if yes.
Er 10
communication failure of frequency
conversion module (alarm when
communication between display
and PCB are disconnected)
Change PCB.
Er 12
excessive exhaust temp protection
1. Replace the compressor discharge temperature
sensor.
2. Reconnect or clean compressor discharge
temperature sensor and wrap it with insulation tape.
Replace the controller or PC Board.
Er 15
Water inlet temperature failure
Check or change the sensor
Er 16
external coil temperature failure
Check or change the sensor
Er 18
exhaust temperature failure
Check or change the sensor
Er 19
DC Fan motor failure
1. Check if DC fan motor is damaged. Change it if
damaged.
2. Check if DC fan motor output port on PCB has
output. Change PCB if no output.
Er 20
Abnormal protection of frequency
conversion module
Solve it according to the subsidiary error codes in the
following table.
Er 21
ambient temperature failure
Check or change the sensor
Er 23
too low cooling outlet water temp
protection
Check whether the water flow or water system is
jammed or not
Er 27
water outlet temperature failure
Check or change the sensor
Er 28
Total current overcurrent protection
Keep the voltage within the normal operating voltage
range of the machine
Er 29
Return gas temperature failure
Check or change the sensor
Er 32
Too high heating outlet water
temperature protection
Check whether the water flow or water system is
jammed or not
