Landlord's responsibilities
Your landlord cannot pass on responsibility for their legal repair obligations by putting clauses in your tenancy agreement.
Depending upon the type of tenancy you have, your landlord will be responsible for most major repairs, for example to:
the structure and exterior of the building, such as the walls, roof, external doors and windows (but not necessarily the garden area)
some common areas, such as entrance halls and drying areas
sinks, baths, toilets and other sanitary fittings, including pipes and drains
heating and hot water
all gas appliances (eg gas cooker, water heater, gas fire)
pipes, chimneys, flues and ventilation
electrical wiring and some electrical appliances
Your landlord is also legally responsible for keeping gas and electrical appliances in safe working order, and arranging for an annual gas safety inspection to be carried out by a registered Gas Safe engineer on all the gas installations and appliances provided by the landlord. (The tenant is responsible for making sure any appliances they own are in good safe working order.)
Landlords also have an obligation to ensure that your home is free from any hazards that could affect the health and safety you and your family.
Your landlord is also responsible for putting right any damage to internal decorations that are caused by repair problems or while repairs were being carried out.
Your landlord will not be responsible for problems he is not aware of.
Once told about a problem, it is the landlord's responsibility to start repairs/maintenance within a reasonable time