Glow Worm boiler won't switch off

[weller]

Hi all. I've done some reading of other threads before I wrote this but the nearest I can find that meets my issue is this
//www.diynot.com/forums/viewtopic.php?t=161598

However, it's not exactly the same problem. So.....

I have a Glow Worm Hide Away boiler, which I imagine is pretty old anyway. When i went to bed last night I noticed that heating was on (despite it not being timed to come on) and it has stayed on all night, ignoring any preset time settings.

The only way I could shut the heating off was to close down the boiler by either switching off the pump, turning off the boiler or switching off the control panel (whic controls the timings etc).


Sorry for the basic description but I'm not a plumber and so learning as I go along.

Having done some reading of an old DIY manual, could this be a servo motor problem? Could it also be something else?

Any advice appreciated.
Thanks

 

[Steve69the69Gas]

Frost stat kicking in - cos its bloody cold

 

[weller]

Maybe? But it's been colder recently, without doing it Will switch it back on for the rest of the date and monitor then

 

[gas4you]

Sadly the post you point to is about a combi boiler, nothing at all like yours.

Have you got any zone valves fitted? If so it will probably be one of these with a sticking microswitch if not a frost stat problem.

Is the boiler in a garage or the like, or indoors?