Sky have been writing to customers in Gloucestershire asking them to check their On Demand Connector and/or their Sky Wireless Booster.
The company said there is a “possible safety issue” with the power adaptor that was included with the product.
It told customers to check if both screws in the power adaptor are fully inserted.
In a letter headed Important Safety Information: Action Required, Chris Syylianou, managing director of customer services, wrote: “Our quality checking process has identified a possible safety issue with the power adaptor that was included with your product.
“Our investigations tell us this issue only affects a small number of units.”
Customers are given a checklist of what to examine and to call a freephone number on 08000 152 582 with any concerns.