17
MZ series
17
7 Troubleshooting
The error code will be displayed on the wired controller and the main board of the outdoor
unit The meaning of each error, as shown in table 12.
Table 12
Name of malfunction
The indicator display
Yellow light
Red light
Green light
Compressor runs
Flash once
Defrost
Flash twice
Anti-freezing protection
Flash 3 times
IPM protection
Flash 4 times
AC over-current protection
Flash 5 times
Over-burden protection
Flash 6 times
Compressor exhaust high temperature protection
Flash 7 times
Compressor overload protection
Flash 8 times
Power protection
Flash 9 times
EEPROM reads and write protection
Flash 11 times
Low PN voltage protection
Flash 12 times
Over voltage protection for PN
Flash 13 times
PFC protection
Flash 14 times
PFC module temperature protection
Flash 15 times
Low pressure protection
Flash 17 times
High pressure protection
Flash 18 times
Limit/decline frequency(electric current)
Flash 1 times
Frequency limit
（
exhaust
）
Flash 2 times
Frequency limit
（
Over-burden
）
Flash 3 times
Outdoor ambient sensor malfunction
Flash 6 times
Outdoor tube sensor malfunction
Flash 5 times
Exhaust sensor malfunction
Flash 7 times
Attain the temperature of switch on
Flash 8 times
Frequency limit(power)
Flash 13 times
Outdoor fan malfunction
Flash 14 times
Frequency limit(PFC module temperature)
Flash 15 times
PFC module sensor malfunction
Flash 16 times
Liquid pipe temperature sensor malfunction of A
Flash 17 times
Gas pipe temperature sensor malfunction of A
Flash 18 times
Liquid pipe temperature sensor malfunction of B
Flash 19 times
Gas pipe temperature sensor malfunction of B
Flash 20 times
Liquid pipe temperature sensor malfunction of C
Flash 21 times
Gas pipe temperature sensor malfunction of C
Flash 22 times
Liquid pipe temperature sensor malfunction of D
Flash 23 times
Gas pipe temperature sensor malfunction of D
Flash 24 times
Liquid pipe temperature sensor malfunction of E
Flash 25 times
Gas pipe temperature sensor malfunction of E
Flash 26 times
Exit of the condenser tube sensor malfunction
Flash 27 times
Correspondence is normal
Flash n times
（
n=indoor
unit number
）
Communication failure between indoor unit and
outdoor unit
Often bright
（
indoor unit all
Communication failure
）
