Gree GWH12MB-K3DNE3G Service Manual page 24

Service Manual
F4: Outdoor condenser sensor start and short circuit (continuously measured failure in 30S, and dont measure within 10 minutes
after defrosted)
F5: Outdoor exhausting sensor start and short circuit (continuously measured failure in 30S after the compressor operated 3
minutes)
H3: Overload protection of compressor H5: Module protection
PH: High-voltage protection PL: Low-voltage protection
P1: Nominal cooling and heating P2: Maximum cooling and heating
P3: Medium cooling and heating P0: Minimum cooling and heating
(12) Drying Function
You may start or stop the drying function under the modes of cooling and dehumidify at the starting status (The modes of
automatism, heating and air supply do not have drying function). When you start the drying function, after stop the machine by
pressing the switch button, you should keep running the inner fans for 2 minutes under low air damper (The swing will operate as
the former status within 2 minutes, cooling indicator is on for 0.5s and then off for 10s in drying and other load is stopped), then
stop the entire machine; When you stop the drying function, press the switch button will stop the machine directly. When you start
the drying function, operating the drying button will stop the inner fans and close the guide louver.
(13) Memory function when interrupting the power supply
Memory content: mode, swing function, light, set temperature and wind speed. After interrupted the power supply, the machine
will start when recovering the power according to the memory content automatically. If the last remote control command has not
set the timed function, the system will remember the last remote control command and operate according it. If the last remote
control command has set timed function and the power supply is interrupted before the timed time, the system will remember the
timed function of the last remote control command, the timed time will recounted form power on. If the last remote control
command has set timed function, the time is out and the system is start or stop according to the set time when the power supply
is interrupted, the system will remember the operation status before the power supply was interrupted, and do not carry out timed
action; The timed clock will not remembered.
(14)Electric heating band control of outdoor unit
①Compressor electric heating band control:
a) Start condition: the compressor is in off status and the outdoor ambient temperature≤-5°C.
b) Stop condition: the band is off when either of the below condition is met:
1. The compressor is in on status;
2.The compressor is in off status and the outdoor ambient temperature≥-5°C.
c) When outdoor ambient temperature sensor is in malfunction status, the electric heating band stops operation.
②Condenser electric heating band control:
1.When Toutdoor ambient≤1°C, the electric heating band starts working;
2. When enter defrosting and defrosting is finished, the chassis electric heating band starts working for 3min as the compressor
starts. After the compressor starts for 3min and Toutdoor ambient≥3°C, the electric heating band stops operation.
3.When Toutdoor ambient≥3°C, the condenser electric heating band doesn't work.
4.When 1°C<Toutdoor ambient<3°C, the condenser electric heating band keeps the previous status.
When outdoor ambient temperature sensor is in malfunction status, the electric heating band stops operation; the electric heating
band can work again after 2min of last stop.
(15)Compulsive defrosting function
1.Condition of entering compulsive defrosting function;
When the unit and remote controller are set in heating mode and the set temperature is 16°C,continuously pressing
"+,-,+,-,+,-"button within 5s,the indoor unit will enter compulsive defrosting setting and indoor unit will send compulsive defrosting
signal to outdoor unit. When the outdoor unit receives compulsive defrosting signal,it will operate in normal defrosting mode.
When the indoor unit receives the information that outdoor unit has entered defrosting,it will cancel sending compulsive defrosting
signal to outdoor unit.Heating indicator on indoor unit is off for 0.5s and then blinks for 10s.
2.Condition of exiting compulsive defrosting function:
The condition of exiting compulsive defrosting function is the same as that in normal defrosting;after finishing defrosting,outdoor
unit will send the signal of normal operation mode to indoor unit and when the indoor unit receives the signal,it will operate in
normal mode.
(16)Refrigerant recycling function
1.Condition of entering refrigerant recycling function:
Within 5min of energizing,turning on the unit in cooling mode of 16°C,continuously press light button for 3 times within 3s to enter
refrigerant recycling mode;Fo is displayed and send refrigerant recycling signal to outdoor unit.
2.Condition of exiting refrigerant recycling mode:
After entering refrigerant recycling mode,when receive any remote control signal or enter refrigerant recycling mode for 25min,the
unit will exit refrigerant recycling mode.
Operation after refrigerant recycling mode:indoor unit runs in cooling mode,fan speed is super high,set temperature 16°C and the
horizontal louver opens to the min angle.
Operation after exiting refrigerant recycling mode:indoor unit will run is the set status of last time.
Technical Information
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