When your system doesn't stop running even when you switch off on the controller it is an SCU issue.
We will have to come out and replace your SCU and Controller (either new or reconditioned) to fix the issue.
You will receive a phone call to be booked in for the customer service technician to come out and given a quote.
In the meantime, you can climb into your roof and unplug the unit from the power.
Revision 1.3