3 or more
Under the CA Tenant Protection Act, landlords can only raise the rent on a tenant twice within a year. You have the right to write a letter to the landlord to inform them that the rent increase attempt is illegal.
You have the right to continue paying the current base rent but, if you receive a 3-day notice based on the increased amount, then you might want to pay the new (increased) amount. You may be able to get that money back if the Rent Adjustment Program (RAP) determines that the increase was illegal.
If the Landlord insists that you pay the rent increase, and you believe the increase is illegal you can complete a Rent Adjustment Program Petition within 60 days of receiving the rent increase notice.
If you have repairs issues, this is the perfect time to cite those. A good way to enforce your rights is to ask for repairs and ensure that if you get a rent increase, you live in a habitable unit.
To address this, you can write a letter about the invalid eviction notice that includes a list of repair issues that need to be fixed and a desired timeline of when you would like those repairs completed by.