1; use, when a product fails please do not without disassembly.
2 every one to two weeks of time to check the line, foreign body from the space between the rails of the door body.
3: if not charged, proof limit switch position up and down, don't forget to stroke control plus oil every six months.
4: European roller shutter doors now are mostly remote, electric. Manual switch and manual lifting device seems to be a decoration, but every once in a while to operation to see if I could use, so as to avoid causing unnecessary accidents in case of emergency.