A Sky spokeswoman said the fault affected a "relatively small group" of My Sky, My Sky HDi and My Sky+ customers.
She said the issue arose while the company was conducting a provisioning update to a group of customers.
A fix is now being deployed to boxes still affected and is scheduled to be complete before 6pm this evening.
The issues caused a number of problems for subscribers, including loss of some free-to-air or high definition channels, loss of high definition viewing on free-to-air channels or SKY channels , but the company said only a small group lost viewing on all channels for a short period.
MySky users who are still experiencing viewing issues should power reset their decoder and contact SKY. Series link is unlikely to be affected but Sky recommends customers do check their series links to be sure.
Sky TV has also apologised for any inconvenience.
- HERALD ONLINE