Gree FG20/BNa-M, Service Manual

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51
Duct Type Split Air Conditioner
Service Manual
MAINTENANCE
1 TROUBLE TABLE
Trouble
Code
Trouble Name
Origin of
Trouble Signal
Control Description
E1
Compressor High
Pressure Protection
High Pressure
Switch
When high pressure protection has been detected in continuously 3 seconds, shut off
all loadings and shield all buttons and remote control signals. LED blinks and displays
E1. The unit cannot recover automatically. Turn off the unit by pressing ON/OFF,
clearing “E1”and turning off the LED.
E3
Compressor low
pressure protection
Low pressure
switch
After 3min running of compressor, detect signal from low pressure switch. If detect that
low pressure switch is cut off in continuously 30s, the complete unit will stop and display
“E3”while LED blinks. 3min later, if the error has cleared, the complete unit resume
running; If the low pressure switch protection has been detected for 3 times during
30min, the LED will blinks and displays “E3”. The unit cannot recover automatically
which requires pressing ON/OFF, and then clear error code and turn off LED.
E4
Compressor
discharge temp.
protection
Compressor
discharge temp.
sensor.
After the running of compressor, if detect that discharge temp. is higher that 130
℃
in continuously 30s, it is believed that there is high temp. protection of discharge
pipes of compressor. Turn off compressor, external fan and inner fan. LED blinks
and displays corresponding error code “E4”. After 3min stop of compressor, if detect
that the discharge temp. is lower than 90
℃
for continuously 5s, the compressor will
resume running.
Since the first error detected, if detect that there is 3 times of high temp. protection
for compressor discharge pipes in 30min, turn off compressor, external fan and inner
fan. LED blinks and displays corresponding error code “E4”. The unit cannot recover
automatically which requires pressing ON/OFF, and then clearing error code and
turning off LED.
E5
Overloading
Protection of
Compressor
Overcurrent
Protector
If it is detected that overloading switch is cut off for continuously 3 seconds, it is
believed that compressor is in the condition of overloading protection. Turn off
compressor and external fan and the LED blinks and displays the corresponding error
code E5.After 3 min stop of compressor, if the error has disappeared, the compressor
will restart.
From the first error detected, if overloading protection of compressor has been
detected in 3 times in 30 min, turn off all loads (except for 4-way valve) and shield
all buttons and remote control signal except for ON/OFF button. Then LED will
blink and display the corresponding error code E5 and the complete unit cannot be
automatically recovered After turning off the unit by press ON/OFF button, if the error
disappears, clear the error code and turn off the LED.
E6
Communication
malfunction
Terminal COM
After energization, if outdoor unit continuously shows that there is not any feedback
from indoor unit’s mainboard, communication malfunction occurs. In this case,
compressor will be stop and E6 will be displayed. After that, outdoor fan stops. If
heating, the 4 way valve will stop after the compressor stops for adequate time.
If the indoor unit hasn’t received information from outdoor unit for a period of time,
communication malfunction occurs. In this case, indoor unit stop (during heating,
E-heater stopped firstly and the indoor fan blows residual heat). If the display board
hasn’t received information from indoor unit for a period of time, communication
malfunction occurs. In this case, malfunction code is displayed and the unit won’t act.
E9 Indoor fan protection
Fan’s motor switch
or thermal relay
After startup of indoor fan if overloading information of fan breaks for a period of time,
all loads will stops and E9 will be displayed.
F0
Indoor ambient
temp. sensor error
Indoor ambient
temp. sensor
If detect that AD value exceeds 250(short circuit with corresponding temp. 160
℃
)
or less than 5 (open circuit with corresponding temp about -45
℃
), it is believed that
there is error of temp. sensor.
F1
Temp. sensor error
of indoor evaporator
Temp. sensor of
indoor evaporator
If detect that AD value exceeds 250(short circuit with corresponding temp. 160
℃
)
or less than 5 (open circuit with corresponding temp about-45
℃
), it is believed that
there is error of temp. sensor.
F2
Tube sensor
error for outdoor
condensator
Tube sensor
for outdoor
condensator
If detect that AD value exceeds 250(short circuit with corresponding temp. 160
℃
)
or less than 5 (open circuit with corresponding temp about -45
℃
), it is believed that
there is error of temp. sensor.
F3
Outdoor ambient
temp. sensor error
Outdoor ambient
temp. sensor
If detect that AD value exceeds 250(short circuit with corresponding temp. 160
℃
)
or less than 5 (open circuit with corresponding temp about -45
℃
), it is believed that
there is error of temp. sensor.
F4
Discharge temp.
sensor error
Discharge
temp. sensor
If detect that AD value exceeds 250(short circuit with corresponding temp. 160
℃
) or
less than 5 (open circuit with corresponding temp -45
℃
), it is believed that there is
error of temp. sensor.