DC INVERTER U-MATCH AIR CONDITION MAINTENANCE
99
Trouble
Code
Trouble
Name
Origin of
Trouble Signal
Control Description
Vent 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
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