Boiler not working

Other

A tenant of mine reported that her boiler was not working approximately 3 weeks ago. My heating engineer attended within 24 hrs but couldn't gain access, and reattended 2 days later. He left the boiler working but it broke down again shortly after. He reattended several times over approx 7 days, fitting a new primary flow switch. It worked for a couple of days and broke down again (on a Friday). Tenant very angry, managed to get a different engineer out the next day who told me it needed a new pump. Engineer returned and fitted pump, boiler worked for 3 days then broke down again. Engineer returned next day and subsequently ordered manufacturer visit for Weds 11th. Total period of intermittently working boiler 22 days. Total spend so far £390.

Tenant and tenant's father very angry at me and demanding compensation.

Have I breached the contract please?
Am I legally obliged to compensate?
Would offer something as goodwill but tenant is in arrears with rent and been very rude/aggressive with me so not feeling any good will!

Tenant's father threatening to put her into a hotel which he expects me to pay for. Have apologised profusely and responded quickly on every occasion including evenings and weekends, and have pointed out that it's summer, she shouldn't be cold, and she can heat water on the hob or via kettle.

Please advise!

Thanks

Ben Lockett