Service Manual
Installation and Maintenance
23
b. SWING button is used for controlling swing function. If swing function is set, press this button to turn it off. If it is
not set, press this button to turn it on.
c. FANSPEED button is used for adjusting fan speed. The fan speed will be circulated according to the sequence of
AUTO FAN, FANL, FANM, FANH, ATUO FAN.
d. UP, DOWN buttons are used for increasing and decreasing temperature and timer.
e. Mode button is used for mode switching. For heat pump unit, Mode will be circulated according to sequence of
AUTO, COOL, DRY, FAN, HEAT; The HEAT mode signal will be ineffective for cooling only unit and mode will be
circulated according to the sequence of AUTO, COOL, DRY, FAN.
f. Energy-saving mode can only be set by the energy-saving button on remote controller.
g. Sleep function can only be set by the Sleep button on remote controller.
3. Protection Function
3.1 Freeze Protection
When the unit operates at cooling mode, if freeze protection is detected, the compressor will stop operation and
indoor fan will operate at set speed. When freeze protection is removed, the unit will resume previous operation after
3 minutes later.
3.2 Defrosting
When the unit starts defrosting, “H1” is displayed and LED lamp for heating will be off for 3s and blinks once.
3.3Detection of temperature sensor malfunction
a) The ambient temperature sensor is open or short circuit: dual-8 displays F1, the cooling indicator lamp pauses 3s
and blinks 1 time; it is on 0.5s and off 0.5s during blinking.
b) The tube temperature sensor is open or short circuit: dual-8 displays F2, the cooling indicator lamp pauses 3s and
blinks 2 times; it is on 0.5s and off 0.5s during blinking.
c) If malfunctions happened together, the malfunction protection code will be circularly displayed by rotary method.
d) If there is malfunction for temperature sensor, when the unit is on, the compressor or electric heating pipe will stop
operation, the fan will stop when the compressor or electric pipe reaches the temperature point.
