On 04/01/2019 15:55, Dave Plowman (News) wrote:
In article ,
Bill Wright wrote:
On 03/01/2019 15:05, Dave Plowman (News) wrote:
In article ,
Andy Bennet wrote:
I've been told that my electric boiler is useless during a power cut.
Are Gas boiler C.H. pumps, timer and control electronics gas powered?

No - but easy enough to run from a UPS.

You have to common earth and neutral though or the boiler won't ignite.

Ah - right. I've not tried using a propitiatory UPS - I made up my own
system.

But why does it need the neutral and earth common?


The flame failure device will not work. It needs an earth or needs to
believe that there is an earth (even a flat one).

Connect the N and E together and it it has a reference from live to earth.

--
Adam