Gree U-Match 5 Series - Forced Operation Control; Protection Control; High Pressure Protection Control

GREE U-Match 5 SERIES UNIT SERVICE MANUAL
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5min after power is connected, start cooling mode (turn on the unit) and set temperature at 16
℃
, then press “▲,
▼, ▲, ▼, ▲, ▼” (6 times of pressing) in 5s to enter the refrigerant recovery mode. If it is successfully enabled,
the indoor unit will display the corresponding code E3.
After the refrigerant recovery mode is enabled, if remote controller or wired controller sends a signal or the
refrigerant recovery mode has been enabled for 10min, system will exit from refrigerant recovery. If outdoor unit
is shut down because of malfunction, refrigerant recovery will be stopped immediately.
Please note that refrigerant recovery mode cannot be enabled under the following conditions:
1. If temperature is shielded remotely, refrigerant recovery mode cannot be enabled. You need to first unlock
the remote shield against temperature.
2. If temperature is higher than 16 degrees under energy-saving mode, refrigerant recovery mode cannot be
enabled. You need to first turn off the energy-saving mode.
2.2.2.4 Forced Operation Control
This control is used to quickly check whether the unit can operate normally after installation. Wired controller
has to be used to enable this control. For cassette type unit, you can enable the control through the light board.
Enabling method through the light board of cassette type unit: After the unit is installed and connected to
power, press TEST button on the light board to enter forced operation mode. Short-press TEST button (less than
2s), cooling mode will be activated. Long-press TEST button (more than 2s), heating mode will be activated.
Enabling method through wired controller:
Under power-on status,
Forced cooling: press the “▼” button continuously for 5s to enter the forced test mode.
Forced heating: press the “▲” button continuously for 5s to enter the forced test mode.
During test mode, press any button to quit the test mode.
Note:
Forced test mode can only be enabled when the unit is first turned on and not yet receives any remote
controller signal or button control signal.
2.2.3 Protection Control
2.2.3.1 High Pressure Protection Control
System will enable high pressure protection control if the high pressure switch is detected open for
continuously a little time. Under high pressure protection, system will be shut down and display error code E1.
When high pressure protection occurs for the first time, system will restore operation if the high pressure
switch is detected to be reclosed for continuously a little time. When high pressure protection occurs for the