problem with clock or boiler?

[michael c]

Hi guys, I fitted a potterton heatmax for my parents last year with zoned heating seperating the bathroom from rest of the house. All of a sudden the bathroom heating won't turn off. The thermostat is not calling for heat and i have turned the boiler to dhw only but heating is still running. Boiler is within warranty so will probably call the heat team out but would rather make sure its the boiler 1st. I do suspect a boiler fault however it throws me that it is just the one zone. Any ideas greatly appreciated. thanks

 

[Dotty]

Zone valve.

 

[michael c]

much appreciated thanks croppie

 

[michael c]

Problem fixed thanks again