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Malfunction or
Error code
protection
Suction pipe sensor
（Th）error
Communication
error between main
control board PCB
B and main control
board of hydraulic
module
Communication
error between
inverter module
PCB A and main
control board PCB
B
The plate heat
exchanger
refrigerant
inlet(liquid pipe)
temperature
sensor(T2) error.
The plate heat
exchanger
refrigerant
outlet(gas pipe)
temperature sensor
(T2B ) error.
Three times P6
protect
Failure cause and Corrective
action
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.
1.wire doesn't connect
between main control
board PCB B and main
control board of hydraulic
module. connect thewire.
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.
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.
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.
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.
Same to P6
53
Malfunction or
Error code
protection
The indoor
temperature
sensor(Ta) error
The DC fan failure
Main circuit voltage
failure
Pressure sensor
failure
The system outlet
water temperature
sensor T1B failure.
The plate heat
exchanger water
outlet temperature
sensor (TW_out)
error.
The condenser
refrigerant outlet
temperature is too
high in heating
mode for more than
10 minutes.
Failure cause and Corrective
action
1. The Ta senor is in the
interface;
2. The Ta sensor failure ，
change a new sensor or
change a new interface.
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.
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.
1. Pressure sensor
connector is loosen,
reconnect it.
2. Pressure sensor failure.
change a new sensor.
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.
1. The TW_out sensor
connector is loosen.
Reconnect it.
2.The TW_out sensor
connector is wet or there is
water in. remove the water,
make the connector dry.
add waterproof adhesive
3. The TW_out sensor failure,
change a new sensor.
The outside ambient
temperature is too
high(higher than 30℃, the
unit still operate heat
mode. close the heat mode
when the ambient
temperature is higher than
30℃
V.2
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