R-Pro › Field cases › Air conditioning
Infrared Remote Not Responding — pressing buttons causes no AC response
Likely causes
Low battery voltage — AA below 1.1 V causes sharp drop in IR output
Check: Point remote at rear smartphone camera and press button — purple/white blinking means LED OK; no blink = dead battery or LED failure
What to do: Replace with new AA batteries (confirm 1.5 V) → retest. If LED faulty, solder-replace VS1838B or equivalent photodetector
Dirty receiver window — dust and grease on indoor unit front panel
Check: Visually inspect IR receiver window on indoor unit — greasy/dusty film attenuates signal. Test by holding remote within 30 cm directly in front of receiver
What to do: Power off → gently wipe receiver window with isopropyl alcohol swab → power on and verify response
Sunlight or fluorescent interference — direct light above 1000 lux saturates receiver
Check: Draw curtains or turn off fluorescent lights and retest — if remote works after blocking light, interference is the cause
What to do: Review indoor unit installation position — if exposed to direct sunlight, attach light shield. Alternatively replace with wired wall controller
Checking IR LED with rear smartphone camera in 5 seconds is the fastest field diagnosis. Front camera has IR filter and cannot be used.
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
Open R-Pro →