preludecrous

Hi all, New user to the forum and I have searched for an answer with no luck. I have a Watermaid Mark IV Chlorinator and only now realised I might have a problem. When the pump is running on timer mode, the pump will be turned on depending on when I set it. However, there is the other switch that turns the chlorinator on and off which doesn't seem to link to the timer. ie. Pump runs on timer, timer finishes and turns pump off but chlorinator remains on. With the chlorinator remaining on, all the gas starts building at the top of the cell but without water flowing through the cell, I am worried about what damage this is doing to the cell with it being on 24 hours a day but the pump is only running 6 hours a day. Can anyone help? The chlorinator hasn't been modified so this would be the case from day 1 when it was installed. Thanks, Shaun.