Fault Code Lookup

HVAC Sales Master
A910_O
Inverter Fault - Lost Rotor Position
This code typically points to
  • Compressor/inverter rotor-position failure

Next checks to confirm
  1. Not explicitly detailed in accessible snippet beyond fault title

Escalation
3-strikes to permanent lockout
Reset behavior
Lockout handling per platform; active protection lockout can be exited by powering both units off for 1 minute after cause is corrected.
Urgent
Fix now
Source
Rheem RP18AZ Installation Instructions Table 15 and Active Protection exit procedure