4. Usage
Type
Code
Description
Solution
Unit working
statue
Blinking
times
F01
Outdoor ambient
temp. sensor failure
Check whether ambient temperature sensor is open, short-circuit or
value drifts too much. Replace it if necessary.
F02
Outdoor evaporator
coil temp. sensor
failure
Check whether outdoor coil temperature sensor is open, short-circuit
or value drifts too much. Replace it if necessary.
F03
Compressor
discharge temp.
sensor failure
Check whether compressor discharge temperature sensor is open,
short-circuit or value drifts too much. Replace it if necessary.
F04
Outdoor Suction
temp. sensor failure
Check whether outdoor suction temperature sensor is open,
short-circuit or value drifts too much. Replace it if necessary.
F05
Evaporating
pressure sensor
failure
Check whether evaporating temperature sensor is open, short-circuit
or broken. Replace it if necessary.
F06
Condensing
pressure sensor
failure
Check whether condensing temperature sensor is open, short-circuit
or broken. Replace it if necessary.
F07
High/low pressure
switch failure
If pressure switch is in open position when unit is in standby statue,
or 2 minutes after compressor stops, unit gives this failure. Check
whether high or low pressure switch is broken or not well connected.
Ambient temperature is too high or too low for unit to work.
This is a normal protection and doesn't need any treatment.
Compressor speed
down
P11
Compressor shut
down due to too
high/low ambient
temperature
Compressor speed
limit due to too
high/low ambient
temperature
P12
Protection
If system pressure is too high , it activates this protection. Unit
recovers automatically after 5 minutes when it happened the first
time. If same failure happened 3 times in a certain period of time,
unit stops until repowered. Check whether fan motor and water pump
is working OK; whether condenser is blocked; whether water
temperature too high, and whether water inlet&outlet temperature
has too big difference (should no bigger than 8
℃
)
Standard function,
doesn't need any
treatment.
This is a normal protection and doesn't need any treatment. When
compressor did not work for long time and ambient temperature is
low, compressor crankcase heater work for certain period of time
before compressor start to warm up the compressor.
Check whether water temperature set value is too high, especially
when ambient temperature is low; whether water flow rate too small;
whether system is lacking of enough refrigerant.
Check whether air circulates fluently in outdoor unit.
P07
Compressor
preheating
P08
Compressor
discharge temp. too
high protection
P09
Outdoor evaporator
coil temp. sensor
protection
P06
Compressor speed
down due to
abnormal high
pressure detected
by condensing
pressure sensor
Unit input voltage too high or too low. Check the voltage of unit
power supply.
P10
AC over high/low
voltage protection
6
Compressor stops
7
8
Compressor stops
9
Compressor stops
10
Compressor stops
11
0
Compressor stops
17
Compressor stops
18
Compressor stops
19
Compressor stops
20
Compressor stops
21
Compressor stops
22
Compressor stops
23
Compressor stops
P14
Compressor speed
down due to
abnormal low
pressure detected
by condensing
pressure sensor
Compressor stops
If system pressure is too low , it activates this protection. Unit
recovers automatically after 5 minutes when it happened the first
time. If same failure happened 3 times in a certain period of time,
unit stops until repowered. Check whether system has not enough
refrigerant or leakage inside(more likely it is not enough refrigerant
that caused this abnormal evaporating pressure); whether fan motor
and water pump is working OK; whether condenser is blocked;
whether EEV whether EEV works normally; whether water
temperature too low, and whether water inlet&outlet temperature has
too big difference in cooling(should no bigger than 8
℃
).
Failure
14
Compressor speed
down
F09
DC fan failure
(one)
Speed of DC fan or one of the DC fan (for dual fan system) can't
reach the required value or no feedback signal. Please check whether
the PCB or fan motor is broken.
25
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