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TWD-1518 multi21+ install_printer.qxp_Layout 1 3/22/17 9:41 AM Page 9
DIAGNOSTIC CODES
Outdoor Unit Indicators
Indoor Unit
Malfunction Name
Display
Yellow
High Temperature
E8
6 flashes
Resistant Protection
and 1 sec Off
Cold Air Protection
E9
EEPROM Memory Malfunction
EE
11 flashes
and 1 sec Off
Module Phase Current Protection -
En
Frequency Decrease/Limit Mode
Module Temperature Protection -
EU
Frequency Decrease/Limit Mode
Refrigerant Leakage Protection
F0
Indoor Ambient Temperature
F1
Sensor Malfunction
Indoor Coil Temperature
F2
Sensor Malfunction
Outdoor Ambient Temperature
F3
Sensor Malfunction
Outdoor Coil Temperature
F4
Sensor Malfunction
Outdoor Discharge Temperature
F5
Sensor Malfunction
Compressor Overload Protection -
F6
Frequency Decrease/Limit Mode
Oil Return Protection - Frequency
F7
Decrease/Limit Mode
System Current Overload Protection -
F8
Frequency Decrease/Limit Mode
High Compressor Discharge
F9
Temperature - Frequency
Decrease/Limit Mode
Possible Causes
Red
1) Incorrect refrigerant charge level
2) Refrigerant metering device malfunction
3) Compressor malfunction
1) Indoor coil has not reach minimum heating temperature
2) Indoor ambient is abnormally cold
3) Indoor control board malfunction
Control board malfunction
Outdoor control board malfunction
11 flashes
1) IPM module over heating or malfunctioning
and 1 sec Off
2) Improper voltage at IPM Module
9 flashes
1) refrigerant leak(s)
and 1 sec Off
2) Indoor coil temperature sensor no calibrated
3) Refrigerant flow is restricted ( ex. valve, exv, debris)
1) Loose or bad connection between sensor and control board
2) Indoor ambient temperature sensor damaged
3) Control board malfunction
1) Loose or bad connection between sensor and control board
2) Indoor coil temperature sensor damaged
3) Control board malfunction
6 flashes
1) Loose or bad connection between sensor and control board
and 1 sec Off
2) Outdoor ambient temperature sensor damaged
3) Control board malfunction
5 flashes
1) Loose or bad connection between sensor and control board
and 1 sec Off
2) Outdoor coil temperature sensor damaged
3) Control board malfunction
7 flashes
1) Loose or bad connection between sensor and control board
and 1 sec Off
2) Discharge temperature sensor damaged
3) Control board malfunction
3 flashes
1) Incorrect refrigerant charge
and 1 sec Off
2) Metering device malfunction
3) Compressor malfunction
Normal function status code only
1 flashes
1) Input voltage too low
and 1 sec Off
2) System pressure too low
2 flashes and
1) Cooling load is too great
1 sec Off
2) Outdoor ambient temperature too high
3) Refrigerant charge too low
4) Metering device malfunction
NOMENCLATURE
Outdoor Unit
38
3
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