No heat tonight, Worcester, Greenstar 18Ri, smart meters, Octopus Energy D/D

MWT

SirFreddy said:

The heating engineer has just left the building, he has diagnosed the problem as the old favourite, of the electronic box attached to the brass valve in the airing cupboard. ( I forget the valve's name).
We have had a couple of these replaced over the past 15 years or so, I think ours is the 28mm one.
I can now recall sliding the little lever over when it has tripped back in the day, perhaps that is something I will have to do until the engineer finds time to fit the valve.

Usually it is just a replacement of the 'box' not the whole valve, so usually a very quick job requiring nothing more than a screwdriver and about 30 mins effort, if that.. 

Heedtheadvice

Unless of course the valve's mechanism is old and sticking. Quite often they fail closed or open.

If it is old a d stiff to operate it is probably worth changing the whole unit rather than just the electrical head. That's not much more expensive in parts but would be a bigger labour cost likely needing the system drained.

WiserMiser

Heedtheadvice said:

Unless of course the valve's mechanism is old and sticking. Quite often they fail closed or open.

If it is old a d stiff to operate it is probably worth changing the whole unit rather than just the electrical head. That's not much more expensive in parts but would be a bigger labour cost likely needing the system drained.

No need to drain the system.  Search for Pipe Freezer Spray.