Midea V8 VRF Series - Page 50

V8 VRF Indoor Units
49
Troubleshooting Guide
6.1.8 A81 - Self-check fault
Error display
Digital display
Display position
Panel, display box, and wired controller
Error impact
Faulty IDU: stops. Other IDUs of the same system:
 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.
ODU of the same system:
 stops.
 V8 platform ODU displays the code "A81", and V6 platform ODU displays the code "U4".
Meaning of the code: MS self-check fault)
Error trigger
The MS self-check fault lasts for at least 10 min
Error recovery
The fault is cleared if one of the following conditions is met:
 Automatic recovery 30 min after the MS fault is cleared
 Power on again
Possible cause
 A fault may occur during the MS self-check process.
Troubleshooting
A81/A82
Open the MS electric
control box connected to
the IDU and check the
error code displayed on
the digital display of MS
electric control box
Follow the instructions of
the MS Maintenance
Guide