Gree GRH120DB-K6NA1A Service Manual page 22

4.2 problem2: dual 8 nixie tube shows F1;
What to do: make sure the indoor ambient temperature sensor is securely connected to the controller.
4.3 Problem3: dual-8 nixie tube shows F2;
What to do: the indoor tube temperature sensor is not securely connected with the controller. Install it again or replace it with a new one.
4.4 problem4: dual 8 nixie tube shows F3;
What to do: make sure the outdoor ambient temperature sensor is securely connected to the controller. Install it again or replace it with a
new one.
4.5 Problem5: dual-8 nixie tube shows F4;
What to do: the outdoor tube temperature sensor is not securely connected with the controller. Install it again or replace it with a new one.
4.6 Problem6: dual-8 nixie tube shows F0.
What to do: check where the refrigerant leaks, repair the leakage and add the refrigerant according to experience.
4.7 Problem7: dual-8 nixie tube shows H3.
What to do: power off the unit , then power on and turn on the unit again few minutes later.
4.8 Problem8: dual-8 nixie tube shows PL; the unit stops except the LED light; cooling indicator flashes 2 seconds and stop 3 seconds
circularly.
What to do: when cooling indicator stops flashing, press ON/OFF button once to turn the unit off and then turn on the unit again 2 minutes
later.
4.9 Problem9: dual-8 nixie tube shows E8.
What to do: power off the unit , then power on and turn on the unit again few minutes later.
4.10 Problem10: dual-8 nixie tube shows JF.
What do to: confirm the connection between the WIFI detection board and the main board is correct and firm; install the WIFI inspection
board again; replace the WIFI detection board with a new one with the same model;Replace the mainboard with the same model.
Technical Information
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