VESSER CGU12N, Service Instructions Manual, Page: 79 / 177

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Trouble
Code
Trouble Name
Origin of
Trouble Signal
Control Description
F0
Failure of Indoor Room
Sensor at Air Intake
Indoor environment
Thermal bulb
Open-circuit or short-circuit of the indoor environment thermal bulb is
detected for continuous 5 seconds, indoor environment temperature will
be set compulsively at 24 degree, the system does not take any measure,
and only the indicator is twinkling or fault code F0 is displayed. After the
fault is removed, the system can restore operation by itself. Under air
supply mode, only the fault is displayed and the indoor fan is running
normally. The fault display disappears when the fault is removed.
F1
Failure of Evaporator
Temp. Sensor
Indoor evaporator
thermal bulb
Open-circuit or short-circuit of evaporator thermal bulb is detected
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mode, the system will be shut off; and under heating mode, all loads
except for the four way valve are shut off. The indicator is twinkling
or fault code F1 is displayed. The system can restore by itself and
display fault elimination after the fault is removed. Under air supply
mode, only the fault is displayed and the indoor unit is running
normally. The fault display disappears when the fault is removed.
F2
Failure of Condenser
Temp. Sensor
Outdoor condenser
thermal bulb
Open-circuit or short-circuit of condenser thermal bulb is detected
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mode, the system will be shut off; and under heating mode, all loads
except for the four way valve are shut off. The indicator is twinkling
or fault code F2 is displayed. The system can restore by itself and
display fault elimination after the fault is removed. Under air supply
mode, only the fault is displayed and the indoor unit is running
normally. The fault display disappears when the fault is removed.
For other types of refrigeration machines except for air duct
machine, condenser thermal bulb is not detected.
F3
Failure of Outdoor
Ambient Sensor
Outdoor environment
thermal bulb
Open-circuit or short-circuit of outdoor environment thermal bulb
is detected for continuous 5 seconds, under refrigeration and
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mode, all loads except for the four way valve are shut off. The indicator
is twinkling or fault code F3 is displayed. The system can restore by
itself and display fault elimination after the fault is removed. Under air
supply mode, only the fault is displayed and the indoor unit is running
normally. The fault display disappears when the fault is removed.
F4
Failure of Exhaust
Temp. Sensor
Discharge
thermal bulb
After the compressor is started, open-circuit of discharge thermal
bulb is detected for continuous 5 seconds. Under refrigeration and
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loads except for the four way valve are shut off. The indicator is twinkling
or fault code F4 is displayed. And the buzzer gives out an alarm. After the
fault is removed, the system will restore by itself and clear the fault code.
If discharge thermal bulb is short circuited, under refrigeration and
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loads except for the four way valve are shut off. The indicator is twinkling
or fault code F4 is displayed. And the buzzer gives out an alarm. After the
fault is removed, the system will restore by itself and clear the fault code.
F5
Failure of Indoor
Room Sensor at
Wire Controller
Line controller
Open-circuit or short-circuit of line controller thermal bulb is detected
for continuous 5 seconds, indoor environment temperature will be set
compulsively at 24 degree, the system does not take any measure, and
only the indicator is twinkling or fault code F0 is displayed. After the
fault is removed, the system can restore operation by itself. Under air
supply mode, only the fault is displayed and the indoor fan is running
normally. The fault display disappears when the fault is removed.