Gree GMV-1015WM/G-U, Руководство по обслуживанию

Страница: 104 / 331

Gree GMV6 DC Inverter VRF Units Service Manual
102
If the communication cord of mode exchanger IDU and ODU is not correctly connected, it will report IDU and
ODU network communication abnormality; if data tested in 5 consecutive seconds is back to normal, the error will
be resumed.
Possible reasons:
■ Mode exchanger IDU and ODU communication cord is incorrectly connected.
■ Mode exchanger main board is damaged.
Troubleshooting:
Step 1: check if the communication cord between mode exchanger and IDU and ODU again to see if it is
correctly connected according to the guidance; otherwise, connect the communication cord again according to
the guidance to see if the problem has been solved;
Step 2: if the connection of communication cord among mode exchanger, IDU and ODU is correct, the
possible error reason might be the damaged main board, please replace the mode exchanger main board.
2.49 “Cy” No communication error on the mode exchanger
Error display:
mode exchanger main board will display
Applicable model: all mode exchangers
Error judgment condition and method:
For the mode exchanger main board, no subcooling electronic expansion valve signal or main board signal is
detected in 1 consecutive minute.
Possible reasons:
■ Poor contact between mode exchanger main control board and ODU main control board terminal
■ For the mode exchanger with several control boards, the contact between the main board and communication
terminal of subsidiary board is poor
■ Circuit is abnormal
Troubleshooting:
For the mode exchanger with only one piece of main board:
Step 1: check the terminal of subcooling electronic expansion valve on the main board of mode exchanger
to see if it is loose or any foreign objects inside? If yes, reconnect it after treatment;
Step 2: if the above inspections are normal, the detecting circuit might be abnormal, please replace the mode
exchanger main board.
For the mode exchanger with several main boards
Step 1: check the mode exchanger, is one piece of main board reporting alarm or are all main boards
reporting alarm?
Step 2: if one piece of main board is reporting alarm, please check the communication terminal between this
main board and other main boards to see if it is loose or any foreign objects inside? If yes, reconnect it after
treatment;
Step 3: if all main boards are reporting alarm, please check the terminal of subcooling expansion valve of
mode exchanger to see if it is loose or any foreign objects inside? If yes, reconnect it after treatment;
Step 4: if the above inspections are normal, the detecting circuit might be abnormal, please replace each main
board of mode exchanger in turn; then replace it after confirming the faulted board.