What LO / UL Means
LO means the control is locked; it shows for a second when locked and whenever a key is pressed. UL shows for a second when it is unlocked. The Icon manual sets and releases the lock by holding CONTROL LOCK for three seconds.
Common Causes of LO / UL
- Control lock switched on
🔧 One Safe Check You Can Try
Hold CONTROL LOCK for three seconds until UL appears.
⚠ Why You Shouldn't Go Further Than That
- No repair is needed.
- If LO persists after holding the key, a keypad problem may be present.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.