R-Pro › Field cases › VRF systems
Horizontal Indoor Unit Airflow Louver Malfunction
Likely causes
Louver stepper motor failure — coil resistance deviation causing non-operation
Check: Remove louver motor connector and measure coil resistance: normal 50–100Ω — check for open circuit (infinity) or abnormal value
What to do: Replace stepper motor → after replacement, power-cycle to initialize louver → verify normal operating range
Louver linkage (connecting parts) broken or detached
Check: Check if louver moves during manual operation → visually inspect linkage pins and clips for detachment
What to do: Reattach or replace detached parts → re-verify entire linkage assembly condition → confirm both manual and motorized operation
No louver control signal output — PCB output failure
Check: Measure louver motor connector pin voltage (normal 5V pulse signal) → no signal indicates PCB output port failure
What to do: Cut power and re-seat PCB connector → re-verify signal after restart → replace PCB if faulty
Louver auto-initializes on power cycle — always power-cycle after motor replacement to initialize.
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
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