Midea V8 VRF Series Service Manual page 50

6.1.8 A81 - Self-check fault
Error display
Faulty IDU: stops. Other IDUs of the same system:
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Error impact
ODU of the same system:
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Error trigger
The MS self-check fault lasts for at least 10 min
The fault is cleared if one of the following conditions is met:
Error recovery
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Possible cause 
Troubleshooting
Digital display
IDUs that share the same MS with the faulty IDU will stop operating, while other IDUs remain
in operation.
IDUs that share the same MS with the faulty IDU display the code "A81" (V6 platform IDU
displays the code "U4"). Meaning of the code: MS self-check fault); IDUs that are connected
to other MSs work properly.
stops.
V8 platform ODU displays the code "A81", and V6 platform ODU displays the code "U4".
Meaning of the code: MS self-check fault)
Automatic recovery 30 min after the MS fault is cleared
Power on again
A fault may occur during the MS self-check process.
V8 VRF Indoor Units
Display position
Panel, display box, and wired controller
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