GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
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3.1.2.3 Cautions on Replacement of Master IDU AP1
If the AP1 of the master IDU needs to be replaced, after the IDU is powered on, ―No master IDU
(L7)‖ or ―Project number conflict (C5)‖ alarm may be reported.
(1) Troubleshoot for ―no master IDU (L7)‖ fault
Method 1: If the IDU is configured with wired control, stop the IDU (except for lock mode) and press
and hold the ―MODE‖ button for 5 seconds to enter setting mode. After setting, the ―Master‖ icon will be
highlighted and the wired control buzzer will beep once.
Method 2: If the IDU is configured with lamp board or wired control, set to fan mode, 30°C/86°F, and
press and hold ―-‖ and ―+‖ consecutively three times within 5 seconds. The IDU and wired control will
identify it as a master IDU setting command, and show ―set master IDU success (UC)‖ (5 seconds) and
highlight the ―Master‖ icon respectively.
Method 3: If the IDU is configured with the Debugger, set the IDU to master IDU through this
software.
(2) Troubleshoot for ―project number conflict (C5)‖
If this fault occurs, the number of the new AP1 is identical to that of a unit within the network.
Manually change it to the original number of the faulty AP1 or a unique number. There are three
methods to change project number:
Method 1: If the IDU is configured with wired control, set P42 to a new project number.
Method 2: If the IDU is configured with lamp board, use the special control YV1L1 to set P42 to a
new project number.
Method 3: If the IDU is configured with the Debugger, configure a new project number through this
software.
TIP:
If there are N units within the network, the units should be numbered from N+1.
Special situation:
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