57
Installation and Maintenance
Service Manual
9.2 Flashing LED of Indoor/Outdoor Unit and Primary Judgement
1. Requirement of malfunction display
When several malfunctions happen at the same time, malfunction codes will be displayed circularly.
2. Malfunction display method
(1) Hardware malfunction: it will be displayed immediately, please refer to “Malfunction status sheet”;
(2) Operation status: it will be displayed immediately, please refer to “Malfunction status sheet”;
(3) Other malfunction: It will be displayed after the compressor has been stopped for 200s, please refer to “Malfunction
status sheet”.
(Note: when the compressor starts up again, malfunction display waiting time (200s) will be cleared.)
3. Malfunction display control
Indoor unit displays malfunction code as shown in the sheet below. ODU communication light will be off for 1s and then blink
for 1s circularly.
Malfunction status sheet
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8
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5
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6
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U
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ti
w
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c
a
b
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e
F
Indoor ambient temperature sensor is open/short circuited
Hardware malfunction
F1
Indoor evaporator temperature sensor is open/short circuited
Hardware malfunction
F2
Liquid valve temperature sensor is open/short circuited
Hardware malfunction
b5
Gas valve temperature sensor is open/short circuited
Hardware malfunction
b7
Modular temperature sensor is open/short circuited
Hardware malfunction
P7
Outdoor ambient temperature sensor is open/short circuited
Hardware malfunction
F3
Outdoor condenser middle pipe temperature sensor is
open/short circuited
Hardware malfunction
F4
Outdoor discharge temperature sensor is open/short
circuited
Hardware malfunction
F5
6
E
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a
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m
m
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C
Malfunction of phase current detection circuit for compressor
Hardware malfunction
U1
Compressor demagnetization protection
Viewing malfunction code
through remote controller within
200s; displayed directly on
nixietube after 200s
HE
3
U
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8
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M
Refrigerant lacking or blockage protection of system (not
available for residential ODU)
F0
U
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9. Maintenance
