CALIFORNIA FAMILY CODE
MODIFICATION, TERMINATION, OR SET ASIDE OF SUPPORT ORDERS
Family Code Section 3691
The grounds and time limits for an action or motion to set aside a support order, or any part or parts thereof, are governed by this section and shall be one of the following:
(a) Actual fraud. Where the defrauded party was kept in ignorance or in some other manner, other than his or her own lack of care or attention, was fraudulently prevented from fully participating in the proceeding. An action or motion based on fraud shall be brought within six months after the date on which the complaining party discovered or reasonably should have discovered the fraud.
(b) Perjury. An action or motion based on perjury shall be brought within six months after the date on which the complaining party discovered or reasonably should have discovered the perjury.
(c) Lack of Notice.
(1) When service of a summons has not resulted in notice to a party in time to defend the action for support and a default or default judgment has been entered against him or her in the action, he or she may serve and file a notice of motion to set aside the default and for leave to defend the action. The notice of motion shall be served and filed within a reasonable time, but in no event later than six months after the party obtains or reasonably should have obtained notice (A) of the support order, or (B) that the party' s income and assets are subject to attachment pursuant to the order.
(2) A notice of motion to set aside a support order pursuant to this subdivision shall be accompanied by an affidavit showing, under oath, that the party's lack of notice in time to defend the action was not caused by his or her avoidance of service or inexcusable neglect. The party shall serve and file with the notice a copy of the answer, motion, or other pleading proposed to be filed in the action.
(3) The court may not set aside or otherwise relieve a party from a support order pursuant to this subdivision if service of the summons was accomplished in accordance with existing requirements of law regarding service of process.