Error
code
Malfunction or protection Failure cause and Corrective action
E0
Flow switch error(E8 displayed
3 times)
1.The wire circuit is short connected or open.
Reconnect the wire correctly.
2.Water flow rate is too low.
3. Water flow switch is failed, switch is open or close continuously, change the water
flow switch.
E1
Phase sequence fault (only for
three-phase unit)
1.Check the power supply cables should be connected stable, to avoid phase loss.
2.Check the power supply cables sequence, change any two cables sequence of the
three power supply cables.
E2
Communication error between
wired controller and unit
1.wire doesn’t connect between wired controller and unit. Connect the wire.
2.Communication wire sequence is not right.
Reconnect the wire in the right sequence.
3. Whether there is a high magnetic field or high power interfere, such as lifts, large
power transformers, etc..
To add a barrier to protect the unit or to move the unit to the other place.
E3
The backup heater exchanger
outlet water temperature sensor
(T1) error
1. The T1 sensor connector is loosen. Reconnect it.
2.The T1 sensor connector is wet or there is water in. Remove the water, make the
connector dry. Add waterproof adhesive.
3.The T1 sensor failure, change a new sensor.
E4
The domestic hot water tempe-
rature sensor (T5) error
1.The T5 sensor connector is loosen. Reconnect it.
2.The T5 sensor connector is wet or there is water in. Remove the water, make the
connector dry. Add waterproof adhesive.
3.The T5 sensor failure, change a new sensor.
E5
The condenser outlet refrige-
rant temperature sensor (T3)
error.
1. The T3 sensor connector is loosen. Reconnect it.
2.The T3 sensor connector is wet or there is water in. Remove the water, make the
connector dry. Add waterproof adhesive.
3. The T3 sensor failure, change a new sensor.
E6
The outdoor air temperature
sensor (T4) error.
1. The T4 sensor connector is loosen. Reconnect it.
2.The T4 sensor connector is wet or there is water in. Remove the water, make the
connector dry. Add waterproof adhesive.
3. The T4 sensor failure, change a new sensor.
E8 Water flow failure
Check that all shut off valves of the water circuit are completely open.
1 Check if the water filter needs cleaning.
2 Refer to "9.4 Charging water"
3 Make sure there is no air in the system (purge air).
4 Check on the manometer that there is sufficient water pressure. The water pressu-
re must be >1 bar.
5 Check that the pump speed setting is on he highest speed.
6 Make sure that the expansion vessel is not broken.
7 Check that the resistance in the water circuit is not too high for the pump (refer to
"Setting the pump speed" ).
8 If this error occurs at defrost operation (during space heating or domestic water
heating), make sure that the backup heater power supply is wired correctly and that
fuses are not blown.
9 Check that the pump fuse and PCB fuse are not blown.
E9 Suction pipe sensor (Th) error
1. The Th sensor connector is loosen. Re connect it.
2.The Th sensor connector is wet or there is water in. Remove the water, make the
connector dry. Add waterproof adhesive.
3. The Th sensor failure, change a new sensor.
Error
code
Malfunction or protection Failure cause and Corrective action
ERROR CODE AND TROUBLESHOOTING
H0
Communication error between
PCB board and idronic control
board
1.wire doesn’t connect between indoor unit and outdoor unit. connect the wire.
2.Communication wire sequence is not right. Reconnect the wire in the right sequence.
3. Whether there is a high magnetic field or high power interfere, such as lifts, large
power transformers, etc.. To add a barrier to protect the unit or to move the unit to the
other place.
H1
Communication error between
PCB A and PCB B
1. Whether there is power connected to the PCB and driven board. Check the PCB
indicator light is on or off. If Light is off, reconnect the power supply wire.
2.if light is on, check the wire connection between the main PCB and driven PCB, if
the wire loosen or broken, reconnect the wire or change a new wire.
3. Replace a new main PCB and driven board in turn.
H2
The plate heat exchanger
refrigerant inlet (liquid pipe)
temperature sensor(T2) error.
1.The T2 sensor connector is loosen. Re connect it.
2.The T2 sensor connector is wet or there is water in. Remove the water, make the
connector dry. Add waterproof adhesive
3. The T2 sensor failure, change a new sensor.
H3
The plate heat exchanger refri-
gerant outlet (gas pipe) tempe-
rature sensor (T2B ) error.
1. The T2B sensor connector is loosen. Re connect it.
2.The T2B sensor connector is wet or there is water in. Remove the water, make the
connector dry. Add waterproof adhesive
3. The T2B sensor failure, change a new sensor.
H4 Three times P6 protect
Same to P6
H5
The indoor temperature
sensor(Ta) error
1. The Ta senor is in the interface;
2. The Ta sensor failure change a new sensor or change a new interface.
H6 The DC fan failure
1. Strong wind or typhoon below toward to the fan, to make the fan running in the
opposite direction. Change the unit direction or make shelter to avoid typhoon below
to the fan.
2.fan motor is broken, change a new fan motor.
H7
Main supply voltage circuit
voltage out of limits
1. Whether the power supply input is in the available range.
2. Power off and power on for several times rapidly in short time. Remain the unit
power off for more than 3 minutes than power on.
3. the circuit defect part of Main control board is defective. Replace a new Main PCB.
H8 Pressure sensor failure Pe
1. Pressure sensor connector is loosen, reconnect it.
2. Pressure sensor failure. change a new sensor.
H9
The system outlet water tempe-
rature sensor T1B failure.
1. The T1B sensor connector is loosen. Reconnect it.
2.The T1B sensor connector is wet or there is water in. remove the water, make the
connector dry. add waterproof adhesive
3. The T1B sensor failure, change a new sensor.
HA
The plate heat exchanger water
outlet temperature sensor
(Twout) error
1. The Twout sensor connector is loosen. Reconnect it.
2.The Twout sensor connector is wet or there is water in. remove the water, make the
connector dry. add waterproof adhesive
3. The Twout sensor failure, change a new sensor.
HE
The condenser refrigerant
outlet temperature is too high in
heating mode for more than 10
minutes.
The outside outdoor air temperature is too high(higher than 30°C , the unit still ope-
rate heat mode. close the heat mode when the outdoor air temperature is higher than
30°C
HF PCB B EEprom failure
1. The EEprom parameter is error, rewrite the EEprom data.
2. EEprom chip part is broken, change a new EEprom chip part.
3. Main PCB is broken, change a new PCB.
HH
H6 displayed 10 times in 2
hours
Refer to H6
P0 Low pressure protection
1. System is lack of refrigerant volume. Charge the refrigerant in right volume.
2.When at heating mode or heat water mode, Heat exchanger is dirty or something is
block on the surface. Clean the heat exchanger or remove the obstruction.
3. The water flow is low in cooling mode.
4. Electrical expansion valve locked or winding connector is loosen.
Tap-tap the valve body and plug in/ plug off the connector for several times to make
sure the valve is working correctly. And install the winding in the right location.
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