We moved into our new house a few months ago, which has a Worcester 24i combi boiler. At first we had no need of the central heating (ut being a hot summer and all), but noticed that sometimes we could run the hot taps for ages (with the boiler firing up) and getting no hot water out. What we had to do was run the tap, turn it off for a few seconds, then turn it back on and the hot water would finally emerge. That wasn't too bad, as we knew that we just had to turn the taps on then off then on again.
Once the weather turned, the central heating kicked in and since then we've not had the problem with the taps - hot water comes out first time as it should.
This morning though, we woke up to find the house freezing - the central heating is on a timer, and should have kicked in about an hour before we got up. Although the boiler was fired up, the radiators were stone cold. Checked the thermostat, no problem. Anyhow, once the hot taps had been turned on so I could have a wash (hot water came out of there straight away), the radiators began to warm up, as if the act of turning the hot tap on had sparked them into action.
Knowing nothing about boilers, I hope the above information is enough for someone more knowledgeable than me to figure it out!
Something else, which is more annoying than anything else, is that when the central heating is on, the boiler will repeatedly fire up than switch off immediately, about 10-15 times before finally firing up and staying on for a while. Is this normal? I only ask as the bathroom is right next to where I work, and the noise of the boiler clicking on and off every few seconds is quite distracting!
Hope someone can make something of all this!