Cooper & Hunter FG20/C-M, Service Manual

Page: 48 / 91

DUCT TYPE SPLIT AIR CONDITIONER MAINTENANCE
45
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 shields
all buttons and remote control signals. LED blinks and
displays E1. The unit cannot recover automatically. Turn
off the unit by press ON/OFF, clear “E1”and turn 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 detect 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