Boilder and pump keep running when demand has stopped

[SJB060685]

Thanks for info on the boiler. I agree links wont magically appear, I was simply going through all the potential causes

 

[Ziggie]

Thought that I didn’t problem solve properly - so bear with me as a non electrician and non plumber.
Definition of problem : boiler runs when there is no demand on an S plan system
Check 1: confirm that hot water is not gravity fed and central heating is S plan.
Check 2: No demand means all timers and thermostats are not requesting.

Check 3: does the 3amp fused spur switch work and stop the boiler?



question 2: when did the problem start and when can you say the system was last working properly?
Question 3: any changes at the time ?
Question 4: is problem reproducible ?

 

[Ziggie]

Hi,

given the time delay, can we assume that the problem has been fixed.

it would be very helpful if you could let us know the solution to add to the knowledge base.

 

[ice123]

Hi,

given the time delay, can we assume that the problem has been fixed.

it would be very helpful if you could let us know the solution to add to the knowledge base.

Sorry for the delay in getting back on to this forum. After extensive troubleshooting, turned out that a loose wire within the boiler was causing it to fire ??!! Having removed the erroneous wire. it seems to be behaving as it should. Nobody has touched it since it was last serviced, so no idea why this happened. Boiler being serviced soon so will ask them to make sure all is OK.

Thank you to all who helped with the diagnosis.