Servowarm

[Servowarmuser]

I know most responses to this post will suggest I skip the system but it has been bulletproof in the past - however now the system does not fire when the stat calls for heat. Pump is cutting in, pilot light ok.
In previous posts Agile has said that he'd still look at one of these, I'm in London

 

[Agile]

There are several different models but mostly now rather old like over 20 years.

Yours seems a very simple fault but parts are getting more difficult/expensive to obtain.

There comes a time when replacement is sometimes a better option. Trouble is that every time that I repair one the owner puts off the replacement.

Tony