Gree U-MATCH Series Service Manual page 90

 E9 Full Water Protection
 F0 Malfunction of Indoor Ambient Temperature Sensor
E9 protection
If the unit is
installed with
water pump
Yes
Check if the
water pump
works normally
Yes
Replace the full water switch
or make sure the float of full
water switch works normally
Malfunction of
indoor ambient
temperature
sensor
Check if the
indoor ambient temperature
sensor on mainboard is inserted
on the needle
stand correctly
Yes
Disconnect
the temperature sensor and
measure if its resistance is
normal
Yes
Replace the indoor
mainboard
U-Match Series DC Inverter Service Manual
Short circuit the full water
No
protection interface on indoor
mainboard according to the circuit
diagram
No
Replace the water pump
Correctly insert the
No
temperature sensor
on the needle stand
No
Replace the
temperature sensor
87