Under the election law, an electoral candidate must maintain a minimum of five years residence in a given constituency before qualifying for the race.
EC member Sodsri Satayathum said on Wednesday that Distad, a first time MP, had been in his domicile for less than three years before the July 3 elections.
Based on the EC ruling, his name appeared on two house registrations, one in Bangkok and another in Nakhon Sawan. He also had two identification cards.
The EC is obliged to forward its ruling for a judicial review by the Supreme Court's Elections Division.
Relevant authorities are expected to explain to the high court how and why the Pheu Thai MP has two domiciles and two IDs.
Should the high court endorse the disqualification, Distad is liable for reimbursement of the by-election cost.