Ruud air conditioner indoor unit displays F5; the blower may not start or may shut off unexpectedly.

Safety first: Turn off power at the breaker. Blower assemblies are heavy, so support them properly when removing them.

• Step 1 – Inspect blower wheel: Remove the blower access panel and check for debris, insulation, or objects lodged in the wheel. Clean it thoroughly.
• Step 2 – Check wheel and motor bearings: Spin the wheel by hand. If it grinds or stops quickly, the bearings may be failing. Replace the blower motor or assembly as needed.
• Step 3 – Verify duct and filter condition: Ensure that filters are clean and that ducts/registers are not blocked. Excessive static pressure can overload the motor.
• Step 4 – Motor wiring/programming: For multi-speed or ECM motors, verify that the correct speed tap or program is selected per Ruud installation instructions. Incorrect settings can cause overcurrent.
• Step 5 – Technician testing: If the F5 error persists, a technician should measure the motor amp draw and compare it to the nameplate rating, then replace the motor if it is overloaded or shorted.