Central heating thermostat wisdom please

[Silvercatowner]

I don't think our thermostat is working to control the heating - the heating is permanently 'on' whatever the thermostat is set to. Obviously we will get a heating engineer to come in to look at it but I was just wondering about the wizzy new thermostats that are available, such as Hive? Ones that are capable of being controlled remotely. Are they worth it? Do they save money in the long run?
Thanks

is it a wireless one?

(expecting the answer "yes")

Sounds like a control valve needs to be replaced. We had the same thing happen to us and the boiler service man never picked up on it. It's on the actual pipe work, so nothing to do with the controller.

is it a wireless one

No! Its wired - something has gone very wrong (or we have a volcano in the house that has gone unnoticed....).

Water is boiling hot (switched off now) and the radiators without thermostats are too hot to touch. Quite scary actually...

We had this and a control valve needed to be replaced. When it goes the default is to switch everything on, sadly for us it was in very hot July!

Faulty thermostats are not uncommon. We had to replace a faulty room thermostat some time ago and then we had a faulty frost stat as well recently. If this is the problem it's an easy and inexpensive fix.
Have you got a combi boiler?

Probably the motorised valve stuck open. There should be a switch on it to turn it off manually.

No! Its wired

then not likely to be the stat, especially if it's an older one with a turny knob. They only have one moving part and are about as likely to go wrong as a teaspoon.

Yes, I also think the motorised valve. Curiously, the stat operates the motor, and the motor operates a switch that turns on the pump and starts the boiler. If it sticks on, the pump and boiler will not stop.