Fault Code Lookup

HVAC Sales Master
A924_O
Inverter Fault - Board Temp
This code typically points to
  • Excessive inverter-board temperature

Next checks to confirm
  1. Verify thermal loading and ambient/airflow conditions around inverter

Escalation
3-strikes to permanent lockout
Reset behavior
Lockout exit per Active Protection after root cause correction.
Urgent
Fix now
Source
Rheem RP18AZ Installation Instructions Table 15 and inverter over-temperature section