§ 95

If the rented property is not in the condition that the tenant can demand according to the legal relationship between the tenant and the landlord at the time of takeover and during the tenancy, and the landlord does not immediately remedy the defect upon request, the tenant may remedy it at the landlord's expense. If the defect concerns the supply of light, gas, heat, cold, etc., the tenant may, with the assistance of the bailiff, gain access to the property's installations to remedy the defect. The 1st and 2nd sentences apply correspondingly if the landlord has unjustifiably interrupted the supply of light, gas, heat, cold, etc. If the defect concerns the supply of heat, heating of domestic water, electricity, or water, the tenant may contact the municipality to resume supply according to the rules in chapter 3 on municipal security of supply with water, heat, and electricity in the Housing Act.

Stk. 2.The tenant may demand a proportional reduction in rent as long as a defect diminishes the value of the rented property for the tenant.