Should my landlord pay for boiler repairs?

The boiler keeps switching itself off after a few hours which almost always means it stops working in the middle of the night and it's cold when I wake up. Tried to get the landlord to fix it but he couldn't and said that the £65 call out charge for repair would be taken out of my deposit if he had to get an engineer out. I'm reluctant to do this as I think it's his responsibility to pay for it.

Does anyone know where I stand?

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Boiler Reading
boiler repair Bracknell