From To Be Cleaned To Cleaned; From To Be Cleaned Or Cleaned To Ready - Iwatsu ICON Series IX-5910 Owner's Manual

Operation
To change the status of a guest room from the DSS:
Press the key on the DSS representing the guest room to have
its status changed
Press the key representing the desired Room Status and the
lamp on that key will change to represent the new status
Room Status
Vacant-Ready
Vacant-To Be Cleaned
Vacant-Cleaned
Occupied (In Room)-Ready
Occupied (In Room)-To Be Cleaned
Occupied (In Room)-Cleaned
Occupied (Out of Room)-Ready
Occupied (Out of Room)-To Be Cleaned
Occupied (Out of Room)-Cleaned
To change the status of a guest room from the guest room:

FROM TO BE CLEANED to CLEANED

Lift the receiver
Wait for the dial tone
Dial
Wait for the confirmation tone
Hang up

FROM TO BE CLEANED or CLEANED to READY

Lift the receiver
Wait for the dial tone
Dial
Wait for the confirmation tone
Hang up
HOSPITALITY FEATURES USER GUIDE - 364
Key Lamp Call Externally
off
red-fast flash
red-slow flash
green
green
& red-fast flash
green
& red-slow flash
green-slow flash
green-slow flash
& red-fast flash
green-slow flash
& red-slow flash
no
no
no
yes
yes
yes
no
no
no