Can the owner sue the property company for invalid property contract?

You can't. 1. The preliminary realty service contract signed by the construction unit and the service enterprise according to law, and the realty service contract signed by the owners' committee and the realty service enterprise selected by the owners' congress according to law are binding on the owners. 2. The owners' committee has not signed a property service contract with the property company, but the owners actually accept the property service, and the owners shall pay the corresponding fees to the property company according to the actual service price. Risk warning: the owner shall pay the property service fee according to the property service contract. If the owner and the user of the property agree that the user of the property shall pay the property service fee, the owner shall bear joint and several liability from the agreement. Property that has been completed but has not been sold or handed over to the property buyer shall be paid by the construction unit.

Legal objectivity:

Article 942 of the Civil Code: Property service providers shall, in accordance with the agreement and the nature of the use of the property, properly repair, maintain, clean, afforest and manage some owners in the property service area, maintain the basic order of the property service area, and take reasonable measures to protect the personal and property safety of the owners. Property service providers shall take timely and reasonable measures to stop acts that violate laws and regulations such as public security, environmental protection and fire protection in the property service area, report to the relevant administrative departments and assist in handling them.