Biasi 24S boiler carries on regardless

[DaveDiyNot]

My Biasi 24S has just started to show the following problem.
When the thermostat is satisfied, the pump continues to heat and circulate water.
If I switch to hot water only, the pump continues to heat and circulate water.
The only way I can control it is to switch to the Off setting.
This started happening today.
Any ideas on this?
Thanks
Dave

 

[Agile]

If the heat is controlled by the hot water temperature knob then there is a fault.

You will need a gas reg engineer to fix it though.

Tony

 

[DaveDiyNot]

Thanks Tony, but it was the Heating, Off, Water knob that I was turning, not the water temperature.
However, I turned to 0 overnight and when I switched to Heating this morning it fired up and has been working correctly ever since.