78
Multi VRF Indoor
Unit Service Manual
MAINTENANCE
1 TROUBLE SHOOTING
1�1 Error Display of Indoor Unit
Error
Code
Error
Source of
error signal
Control description
E1
Compressor
high pressure
protection
High pressure
switch
The high pressure protection value is 4.2MPa. When high pressure of a
compressor is detected for successive three times, the compressor will
stop. Error code E1 will be diaplayed and the running LED will blink.
E2
Indoor
antifreezing
protection
Temperature
sensor of
evaporator
When Tevaporator
-2 lasts for 10min, the antifreezing protection will occur.
The indoor electronic expansion valve will be closed and the capacity is 0.
E3
Compressor
low pressure
protection
Low pressure
switch
When the low pressure protection value (0.15Mpa, absolute
pressure) is reached, the low pressure switch will be disconnected.
The low pressure protection will be displayed.
E4
Compressor
discharge
temperature
protection
Discharge
temperature
sensor
When discharge temperature T is 113
or higher, the stop protection will
temperature is lower than TR and the unit stops for 3min, the compressor
will resume running. If this occurs for three times in one hour, the compressor
can not resume running. It is a must to cut off the power and restart the unit.
E5
Conversion
overcurrent
protection
Compressor
driver
The driving board of conversion compressor is wrong. Refer to the
E6
Communication
Error
Communication
There is communication error between the mainboard of indoor unit or wired
controller and the outdoor unit. The wrong indoor unit will stop and display error code.
E7 User operation
E9
Water full
protection
Water pump
When the water is full for successive 8s, the water full protection
will occur. The wired controller will display E9 and alarm will occur.
In that case, the water pump will work while the other load of indoor
unit will stop. The outdoor unit needs to adjust capacity output.
F0
Ambient
temperature
sensor error
of indoor unit
Ambient
temperature
sensor of
indoor unit
The indoor unit of temperature sensor error displays the error code and stop.
F1
Indoor coil pipe
inlet temperature
sensor error
Indoor coil pipe
inlet temperature
sensor
The indoor unit of temperature sensor error displays the error code and stop.
F2
Indoor coil
pipe middle
temperature
sensor error
Indoor coil
pipe middle
temperature
sensor
The indoor unit of temperature sensor error displays the error code and stop.
F3
Indoor coil
pipe outlet
temperature
sensor error
Indoor coil
pipe outlet
temperature
sensor
The indoor unit of temperature sensor error displays the error code and stop.
F4
Outdoor ambient
temperature
sensor error
Outdoor ambient
temperature
sensor
If short circuit occurs to the temperature sensor, there will be alarm..
The error information will be transmitted to each indoor unit, The error
LED or wired controller will display the error code. When outdoor
ambient temperature is lower than -5
, the break circuit of outdoor
temperature sensor will be shielded. It is treated according to -30
.
F7
Outdoor
defrosting
temperature
sensor error
Outdoor
defrosting
temperature
sensor
If short circuit occurs to the temperature sensor, there will be alarm..
The error information will be transmitted to each indoor unit, The error
LED or wired controller will display the error code. When outdoor
ambient temperature is lower than -5
, the break circuit of outdoor
temperature sensor will be shielded. It is treated according to -30 .
F9
Discharge
temperature
sensor error
Discharge
temperature
sensor
If short circuit occurs to the temperature sensor, there will be alarm..
The error information will be transmitted to each indoor unit, The error
LED or wired controller will display the error code. When outdoor
ambient temperature is lower than -5
, the break circuit of outdoor
temperature sensor will be shielded. It is treated according to -30
.
To Next Page
Loading...
Need help?
General
