Ultra Heat GMV Multi VRF_Heat Recovery Serial
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can be seen in Master Unit Setup S7 of Technical service manual (Set master unit S7 as “00”; Set slave
unit S7 as “10”).
Step 4: Connect power for all indoor units. Make sure all IDUs are power on. Then all outdoor
modules will display “A0”.
Step 5: Find the module with “00” of S7 which is the master module. The main board shows:
Hold SW4 button on the master module for at least 6s to enable debugging. Then the main board
shows:
Press SW4 confirmation button on the master unit to confirm it. Unit will start debugging.
Step 6: Wait. Unit will then start progress 01.
If no error is detected, system will display as below and then start next progress.
If unit have some errors, progress 01 will show the following errors:
System doesn’t have master unit.
Reset master unit.
More than 2 master units are set.
Reset master unit.
Address DIP switch code of system is
shocking.
According to the above errors, reset the master unit (Set master unit S7 as “00”; Set slave unit S7 as
“10”), then start debugging again.
Step 7: Progress 02 is allocating addresses. If allocating addresses is done, then main board
shows:
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