A/A DC INVERTER U-MATCH AIR CONDITIONERS MAINTENANCE
101
Trouble
Code
Trouble
Name
Origin of
Trouble Signal
Control Description
(or display E9): Under cooling and dry mode, the outdoor fan and
compressor will be stopped, while the indoor fan will be stopped after 1
minute. Under heating mode, the outdoor fan and compressor will be
stopped, the 4-way valve will maintain its original state, and the indoor
unit will be stopped after 1 minute. Under fan mode, the indoor loads
will not be stopped.
F0
Malfunction Of
Indoor
Environment
Sensor at
Return air Vent
Indoor room
sensor
If the indoor sensor is detected of open circuit or short circuit for 5
seconds successively, the indoor room temperature will forcibly set to
24 . In this case, the system will not perform any treatment, only the
indicator will blink or display the fault code. The system can
automatically resume after the failure is eliminated. Under fan mode,
only the fault will be displayed, but the indoor unit will run normally. The
fault disappears after it is eliminated.
F1
Evaporator
Temp. Sensor
Malfunction
Outdoor
evaporator
sensor
If the evaporator sensor is detected of open circuit or short circuit for 5
seconds successively: When under cooling and dry mode, the system
will be stopped. When under heating mode, all of the loads except the
4-way valve will be stopped, while the indicator will blink or display the
fault code F1. After the fault is eliminated, the system can automatically
resume to operation and clear the fault display. Under fan mode, only
the fault will be displayed, and the indoor unit will run normally. The
fault disappears after it is eliminated.
F2
Condenser
Temp. Sensor
Malfunction
Outdoor
condenser
sensor
If the condenser sensor is detected of open circuit or short circuit for 5
seconds successively: When under cooling and dry mode, the system
will be stopped. When under heating mode, all of the loads except the
4-way valve will be stopped, while the indicator will blink or display the
fault code F2. After the fault is eliminated, the system can automatically
resume to operation and clear the fault display. Under fan mode, only
the fault will be displayed, and the indoor unit will run normally. The
fault disappears after it is eliminated.
For cooling-only unit, the other units except the duct type will not detect
the condenser sensor fault.
F3
Outdoor
Environment
Sensor
Malfunction
Outdoor
environment
sensor
If the outdoor environment sensor is detected of open circuit or short
circuit for 5 seconds successively: When under cooling and dry mode,
the system will be stopped. When under heating mode, all of the loads
except the 4-way valve will be stopped, while the indicator will blink or
display the fault code F3. After the fault is eliminated, the system can
automatically resume to operation and clear the fault display. Under fan
mode, only the fault will be displayed, and the indoor unit will run
normally. The fault disappears after it is eliminated.
F4
Malfunction of
Exhaust Temp.
Sensor
Exhaust
temperature
sensor
If the outdoor temperature sensor is detected of open circuit for 5
seconds successively after the compressor is started: When under
cooling and dry mode, all the loads will be stopped. When under
heating mode, all of the loads except the 4-way valve will be stopped,
while the indicator will blink or display the fault code F4 and the buzzer
will alarm. After the fault is eliminated, the system can automatically
resume to operation and clear the fault code.
If the outdoor temperature sensor is detected of short circuit: When
under cooling and dry mode, all the loads will be stopped. When under
heating mode, all of the loads except the 4-way valve will be stopped,
while the indicator will blink or display the fault code F4 and the buzzer
will alarm. After the fault is eliminated, the system can automatically
resume to operation and clear the fault code.
F5
Malfunction Of
Indoor
Environment
Sensor at Wire
Controller
Wired controller
If the wired controller is detected of open circuit or short circuit for 5
seconds successively, the indoor room temperature will forcibly set to
24 . In this case, the system will not perform any treatment, only the
indicator will blink or display the fault code. The system can
automatically resume to operation after the failure is eliminated. Under
fan mode, only the fault will be displayed, but the indoor unit will run
normally. The fault disappears after it is eliminated.
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