To find out if the system is working correctly, I think you need to leave the three switches on, and rely on the timeswitch. The Gledhill has some kind of control circuitry, I don't know what it does.
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
