Only properties fitted with the Triton Safeguard+ shower unit, produced between May 2014 and December 2016, are the subject of the inspections.
The NIHE has met with the manufacturer, Triton Showers, and is able to confirm that the units were fitted in 5,000 of its properties.
Over 2,300 of the showers have already been checked by the manufacturer when the potential issue arose.
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A spokesperson for Housing Executive said: "We want to reassure our tenants that their health and safety is paramount.
"Following the incident last week, we have moved to identify potential showers that could be affected and over the course of the next weeks, we will notify those tenants whose homes have had these shower units installed from 2014 to 2016.
"This potential issue only affects a single, individual shower, the Safeguard + unit, produced from May 2014 to December 2016 and only causes problems in a very small percentage of cases.
"Engineers from Triton provide an internal fix for the shower unit on site so these units do not need to be removed.
"We will be in contact with tenants, but if anyone is concerned they can check the shower unit themselves.
"Each shower has code at the underside of the unit and those affected will have a code that begins with CSGPO and the date code will also be stamped as month and year - for example, 05/14.
"Only showers dated 05/14 to 12/16 are possibly affected."
