Problem with Vokera Mynute 20e

[stings27]

Hi all. :smile5:

Got a phone call from a friend last night complaining that his boiler was making strange noises and would not turn off.
The boiler is only serving the rads as his HW is run off an Aga.
On arrival I first turned down the room stat which did nothing, then turned off on programmer, still the boiler kept running. The only way to turn it off was to isolate at the spur.
The strange thing was that the heating was luke warm at best, then there was a surge as water rattled in the EV , then you could not touch the first metre of pipework!
He told me that he had had the PCB replaced a few years ago and I think it is looking likely that it has blown again?
Any advice much appreciated.

Thank you :smile5:

 

[Dotty]

Did you check the pump?

 

[stings27]

Hi Croppie

Thanks for reply
Yes, pump seems ok ( not getting hot) but if it was faulty, would taht explain the boiler not turning off ?

 

[Dotty]

Any zone valves?

 

[stings27]

No ..

 

[bright spark]

Would the boiler not go off when ye turned knob on fromt to off.
Sometimes I've seen timer not wired correctly.
The live wire leaving boiler to timer switch isn't used. They just use a live off the live to power the timer. If ye do this you bypass the on off switch it then won't work.
Timer could also just be gone faulty.
Anyway if ye pull out the fuse on the spur, the boiler is gonna get hot when pump not running to cool it.
I'd check the way it's wired

 

[stings27]

Hi bright spark
Only way boiler will turn off is at the spur.
This is not a new install, its just a problem that has materialised.

 

[bright spark]

No 1 may have ever turned the boiler off on knob on front before.
Just disconnect live to clock inside boiler. Put a link in and see if boiler goes off on on/off knob.
Best of luck

 

[stings27]

Cheers