4. The most common issue is '''loss of dome comms'''. The symptom will be that the dome won't move to a new target, or that it has closed without warning (the telescope will not park, mirror covers will not close: those actions suggest an LCU shutdown). A red warning button will appear labelled "Bad Dome Comms" in the Dome GUI - clicking it should solve the problem. If it does, go to the browser TCS Advanced tab, and in the central panel click "TAKE CONTROL", then turn dome "Tracking" ON and OPEN if the dome had closed without good reason in the middle of observing. If comms are not restored this way, then press Shutdown on the browser TCS and follow the full instructions on [[#Starting SiTech software| starting SiTech software]] to restart. Then reload the browser TCS and run the telescope startup procedure.
5. '''Focus is unresponsive'''. This is typically a comms loss to the SiTech focuser GUI and doesn't respond to the instructions in point 2. Follow the full instructions on [[#Starting SiTech software| starting SiTech software]] to restart.