Gree GMV6 DC Inverter VRF Units Service Manual
Step 1: replace mode exchanger main board to see if the error is solved;
Step 2: if UF error still exists after replacing mode exchanger main board, disconnect the communication
connection of all IDUs and mode exchangers, connect the IDU communication cord one by one to the
communication board of mode exchanger until all the IDUs which have triggered the UF error are tested;
Step 3: update the program for the IDU which triggers UF error or replace the main board.
2.174 “y7” Fresh air inlet temperature sensor error
Error display: ODU main board and IDU wired controller will display
Applicable model: multi VRF indoor unit with fresh air function
Error judgment condition and method:
Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge
the range of AD value. If the sampling AD value exceeds upper limit and lower limit in 5 seconds
continuously, report the error
Possible reasons:
■Poor contact between air inlet temperature sensor and main board interface terminal
■Air inlet temperature sensor is abnormal
■Detecting circuit is abnormal
Troubleshooting:
Yes
”y7” fresh air inlet
temperature sensor error
If it is loosened or there
are foreign objects,
retighten it after treatment
Detecting circuit might
be abnormal
No
Replace the main
control board
No
Replace the inlet tube sensor, is the
error disappeared?
Check the terminal between
main board and fresh air inlet temperature
sensor to see if it is loose or any
foreign objects inside?
No
2.175 “yA” IFD error
Error display: ODU main board and IDU wired controller will display
Applicable model: high-end fresh air floor standing unit
Error judgment condition and method:
After turning on the IFD for 60s, start the error feedback test, if the IFU feedback tested in 5 consecutive seconds
is low level, it’s deemed that IFD is faulted.
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