We have a closed circuit pumped heating system with a condensing boiler and two electrical valves (blue Horstmann Zoneplus F222m and a silver metal valve we can't get to easily to know what it is - we think this may be for CH only) and a pump.

We had a power cut two nights ago and since then, our valve (Horstmann) and pump are running on after the hot water programme has finished. The only way to stop it is to switch the power off to the boiler and central heating controls. The boiler isn't running on and the light on the valve is not illuminated. We've tried moving the lever from Auto (where it is fixed and has little "wiggle" movement whether on or off) to Manual Override which runs the motor on the valve and returns the lever to Auto. This has not resolved the problem.

Our boiler is only 2 months old but the rest of the heating / hot water system is older. We've only owned the house 2 months so have no knowledge of previous problems with it.

Can anyone help with advice on how to fix this problem? Thank you in advance!