No hot water?
If you suddenly find you have no hot water, it may be that the pressure in your boiler has dropped. A boiler will only fire up when the pressure is correct, so if the pressure drops below a certain point, the boiler stops heating up.
To correct this, you need to adjust the pressure by setting the pressure dial to the correct pressure for your boiler. Your boiler manual will give you the specific ideal pressure for your make and model, but it is usually between one and one and a half bars (for most boilers).
The following article explains adjusting boiler pressure: http://www.handymanknowhow.co.uk/plumbing/lowpressureoncombiboiler.htm
Remember, if you report an issue to us and it turns out to be something that you should have done yourself or it is something that is caused by your (or your visitors) actions or failure to act, then you will be liable for the contractor charges.
For more information on the suggested steps above, you can search online to find articles that might be helpful. Our advice is provided in good faith, without any liability accepted by us. You should follow any suggestions with care and attention and if you do not have the skills or know-how required to carry out your tenant-like responsibilities then you ask a competent friend or hire someone to help you.