Arya Samaj Marriage is valid as per Arya Samaj Marriage Validation Act, 1937. But in one case, Rajasthan High Court declared the marriage perform in Arya Samaj null and void on the ground that notices have not been properly served on the concerned parties. The hon'ble High Court of Delhi, as per the reports I have gone through, has taken a strict consideration about the arya samaj marriages held in Jamuna Bazar, Delhi as they have been following illegal methods and on this mandir also, addl. sessions judge Ms. Kamini Lao sought report.
You also find out about the arya samaj mandir where the marriage was solemnized and if there are any irregularities happening in that place in performance of marriage for seeking null and void declaration of marriage.