When the house was decorated, I found the wrong key when I changed it. The property said it would not be replaced during the warranty period.

First of all, the responsibility must be the security door manufacturer, because the whole door body is made by the security door manufacturer.

The second is the warranty period. The warranty period for security doors is generally 2 years. However, if your security door has passed the warranty period, you will have to pay for it even if you find a manufacturer. This is the same as buying a mobile phone. Even if it is useless for more than 2 years, you can't change it to another manufacturer.

Then talk about property. This matter is something you discuss with the former owner, because when he sells your house, he must ensure that there is no problem in selling your house or that you will not pursue the problem after negotiation. The property management company can be an intermediate witness in your affairs, but the property management company is neither a developer nor a seller for you and will not bear any responsibility in this matter.

Also, the price of a lock core is not high now. If you can find a property company to contact the previous manufacturer for replacement, the replacement price may be much cheaper than that on the market.