GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
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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.
①Troubleshoot 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.
②Troubleshoot for ―project number conflict (C5)‖
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