In a Facebook post, the station has rebuked the move.
The TNL channel, which is the oldest private owned radio channel in Sri Lanka, is owned by Shan Wickremesinghe, the brother of PM Ranil Wickremesinghe.
'Sri Lanka Mirror' contacted the presidential secretariat on the matter since the TRC falls under president Maithripala Sirisena.
Responding, a spokesperson from the secretariat said that the transmission centre was sealed due to three reasons.
The station had not secured TRC permission to operate from the said location while permission for the spectrum used has only been obtained on a provincial level, he said.
Also, the channel has exceeded the transmitter capacity for which they had obtained permission on a provincial level, he added.