Enquiry Of Historical Malfunction; Debugging Function - Gree U-MATCH Series Service Manual

U-Match Series DC Inverter Service Manual
Note:
①. If the unit is not connected to outdoor ambient temperature sensor, display of outdoor ambient
temperature will be shielding after energizing for 12hr.
②. If there is malfunction of outdoor ambient temperature sensor, display of outdoor ambient
temperature will be shielding after energizing for 12hr.

4.8 Enquiry of Historical Malfunction

Under off or on state of the unit, continuously press Function and ▼ buttons for 5s to view historical
malfunction.
In enquiry state, set temperature displaying zone displays "00". Press ▲ and ▼ buttons to view the
5 malfunctions happened recently. The timer displaying position displays the detailed error code. The
5th displayed malfunction is the last malfunction.

4.9 Debugging Function

Under off state of the unit, press Function and Timer buttons at the same time for 5s to go to the
debugging menu. Press Mode button to adjust the setting items and press ▲ or ▼ button to set the
actual value.
4.9.1 Setting ambient temperature sensor (dual ambient temperature
sensors function)
Under debugging state, press Mode button to adjust to "00" in temperature displaying zone. Timer
zone displays setting state and press ▲ or ▼ button to adjust. There are 3 selections:
(1) The ambient temperature at air return is set as indoor ambient temperature (timer zone displays
01)
(2) The temperature at wired controller is set as indoor ambient temperature (timer zone displays
02)
(3) Select the temperature sensor at air return in cooling, dry and fan mode; select the temperature
sensor at wired controller in heating and auto mode.
4.9.2 Selecting three speeds in high speed and three speeds in low
speed of indoor fan motor
Under debugging state, press Mode button to adjust to "01" in temperature displaying zone. Timer
zone displays setting state and press ▲ or ▼ button to adjust. There are 2 selections:
(1) Three speeds in low speed (LCD displays 01)
(2) Three speeds in high speed (LCD displays 02)
Three speeds in low speed include high, medium and low speeds; three speeds in high speed
include super high, high and medium speed.
Note: For this series, this function is invalid.
4.9.3 Displaying setting of freeze protection error code
Under debugging state, press Mode button to adjust to "02" in temperature displaying zone. Timer
zone displays setting state and press ▲ or ▼ button to adjust. There are 2 selections:
(1) Displayed (LCD displays 01)
(2) Not displayed (LCD displays 02)
It is defaulted to be not displayed for export unit and be displayed for domestic unit.
4.9.4 Setting refrigerant lacking protection function
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