Be aware that two rules apply to the repair and deduct process.
1. When you write your repair request letter to your landlord, you should list everything that needs to be repaired. If you miss anything, your landlord will not be required to repair anything not listed in your letter for the next 6 months. However, if a problem arises after you send your letter, the six-month rule does not apply and you can request repairs at any time.
2. In a 6 month period, the repairs can be no more than 1/2 the rent for the 6-month period. For example, if your rent is $1000 - you cannot ask your landlord to make more than $3000 worth of repairs in a 6-month period.