IPM module
protection
O
a.
The IPM board is failure;
b.
The outdoor fan is broken;
c.
The outdoor fan motor is failure;
d.
The outdoor fan has been blocked ;
e.
The condenser is dirty;
f.
The outdoor unit has been installed without
standard.
PFC protection
O
a.
The PFC is failure;
b.
The outdoor drive board is failure
Compressor pre
heating process
O
★
O
It is normal mode in cold weather
Chip in outdoor
board in trouble
★
O
a.
Using the wrong drive board;
b.
Using the wrong compressor.
AC voltage higher
or lower
protection
★
★
O
a.
The supply voltage is higher or lower than
normal;
b.
The inner supply voltage of the unit is higher or
lower than normal
DC compressor
start failure
O
O
a.
The outdoor drive board is failure;
b.
The compressor is failure
Outdoor ambient
temperature too
low protection
★
O
O
a.
Outdoor ambient temperature too low
Mark description: the lights flash every two seconds for the following faults
Protection against
overheated
outdoor radiator
a.
Radiator sensors fail
b.
control panel fails
Protection of the
system against too
high pressure
a.
The pressure switch fails
b.
The pressure detection switch on the control
panel fails
c.
The measured value of the system pressure
exceeds the limit
When the compressor is in operation:
Mark description:
★：
Light
：
Flash
：
Off; the flash cycle is 1S
No.
LED1
LED2
LED3 Reasons for the current operating frequency
of the compressor is limited
1
2
★
3
★
★
-
1
8
-
Detection circuit of the sensor on the
Normal frequency rising and decreasing, no
limitation
Frequency decreasing or prohibition of
frequency rising caused by over-current
Frequency decreasing or prohibition of
frequency rising caused by anti-freezing of
refrigeration or anti-oveload in heating
Summary of Contents for WHZ09SZA21S
Page 11: ...Refrigerant circuit Models WHZ09SZA21S and WHZ12SZA21S 10 ...
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