That should get you some heating but it will need repairing. Call some friends and ask them for reliable heating engineers. Yours is a very simple job of replacing the head of the honeywell 3 port valve.
Moving it to manual will open the valve and all the time the hot water cylinder is being heated then your rads should get hot.
Hugh recommended turning up the HW temp on the cylinder stat as this will keep the boiler on for longer as its trying to heat the HW to a higher temperature. Ultimately the boiler thermostat will control the overall temperature.
Make a note of the setting of the Cylinder stat so you can turn it back later.
I think its the valve thats knakered..I've called Home Emergency out but they can't get here til Sat. At least I've got some heat until then, I don't want frost bite
I'll leave it set to manual until they come out.... is it wise to turn that thermostat on the boiler any higher to keep it fired up?
Yes, but it should take a while if you have managed to wedge the valve open. The flow from the boiler will also be going around the radiators, and so the tank will take a bit longer to heat up.
If you want to check, then look at the valve as a T. The vertical pipe is the input from the boiler, and then outputs left and right go to HW tank and rads respectively. You should be able to follow the output from the valve to cylinder, the other goes to the rads. If both are heating up then you've got some heating until the problem can be sorted as Mr Smyth has explained.
Glad we could be of some use, nice to be able to at least get you some heating going again, even if as a temporary fix.
Honestly, you don't realise how much you taking your boiler for granted!
I've put it to 65, radiators are already hot! Can't tell you how grateful I am! You all must be so busy at this time of year so I really do appreciate your time
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