According to the company, it received a warning from Russia’s industrial regulator Rostekhnadzor about the turbine failure. The problems were reportedly detected during scheduled maintenance work, and the pipeline will not be able to operate without proper repairs, according to Gazprom.

The Russian firm said it has informed German manufacturer Siemens about the turbine failure and the need for an overhaul.

Repairs on the Nord Stream 1 pipeline were originally scheduled from August 31 until September 3, prompting a full shutdown of gas flows.

Since July, the Nord Stream 1 pipeline has been operating at reduced capacity due to the shutdown of several gas turbines. Some were sent to Montreal for repairs and were stuck there due to Canadian sanctions on Russia over the conflict in Ukraine. At Germany’s request, Ottawa announced an exemption for the turbines in July, and returned one turbine, but Gazprom refused to take delivery, citing irregularities in the documentation.

Gazprom has cited faulty or delayed equipment as the main reason for the 80% reduction of deliveries via the pipeline. The Kremlin said this week that only sanctions prevent Nord Stream 1 from working at full capacity. Gazprom CEO Alexey Miller also warned the sanctions could obstruct Siemens Energy from carrying out regular maintenance of the pipeline’s equipment.

Meanwhile, the newly-built Nord Stream 2 pipeline stands idle as Germany has refused to certify it for operation.