Central heating controls/timer - Central Heating job in Wood Green, North London

Job description

Having what I believe is an electrical problem with the pump, which shuts down by itself. You can sometimes leave it with all controls off for 10-15 mins and then it sometimes restarts. You cannot re-start it straight away. But now its proving difficult to get it to re-start even after 10-15 mins.

I have had 3 different boiler men trying to resolve this problem. Two of them have changed the pump but this has not worked and one of them has flushed/de-sludge the system but this hasn't worked.

I believe it is an electrical fault with the Central heating controls/timer where you can set auto or constant function. It probably needs replacing as its old and been there since the 70s.