Can I enter the property to do repairs?

With at least 24 hours’ written notice, at a reasonable time, and with the tenant’s agreement. Owning the place does not give you a key to use as you like.

The tenant has a right to quiet enjoyment. Entering without consent is trespass, and doing it repeatedly can amount to harassment, which is a criminal offence.

Genuine emergencies are the exception: a fire, a flood, a gas leak. Convenience is not an emergency.

If a tenant repeatedly refuses access for a safety check, put it in writing and keep the record. That evidence matters far more later than forcing the issue would.