Pump constantly running

[Rma72]

Dear all,

This is my first post on here and any help that I can get would be most appreciated. I am going to call my plumber on Monday - but would like help understanding something that is happening to my heating system.

We had a powercut today and this made me notice that the boiler was on constantly ( this could have been for a while!)

This led me to notice that our Grundfos UPS3 Pump is constantly on and does not turn off. We have 3 actuators (UFH, DHW and rads upstairs). We have a secondary return pump on a timer that seems to be working well.

None of these are on and the actuators seem to be doing their job.

The boiler is also firing up bit turning off straight after, even when there is no demand.

All pipes are hot for each of the actuators. I am by no means a plumber, and would like to understand what is going on here.

Could it be the boiler PCB or the pump?

Any help ot advice would be greatly appreciated and sorry if I have gone around the houses or misunderstood something.

I have a trustworthy plumber who I’ll call on Monday, but this one is baffling me somewhat!

 

[cross thread]

Probably a zone valve switch stuck on

 

[Rma72]

All of the valves are in the off position and seem to be working. However, could one of the electric switches be telling it to heat even though it isn’t actually doing so?

 

[Jurassicspark]

Yes, jammed from the inside. A multimeter can rule this out.

 

[Rma72]

Thank you. I shall get my plumber onto it on Monday - depending on his availability.

This new heating system in our house is so complicated compared to what we had.

My plumber will be able to find the problem - surely?

 

[Jurassicspark]

This new heating system in our house is so complicated compared to what we had.

Send a picture.

My plumber will be able to find the problem - surely?

Surely - if you call the right person.

 

[Rma72]

 

[Rma72]

Do these help?

 

[Rma72]

Thank you so much . I am grateful for your help.

 

[Jurassicspark]

S plan w combi and cylinder.
A lot of YT vids explaining heating systems.

 

[Iddy]

This is a new install? They may have left an electrical link in the boiler that should have been removed when the system controls were connected.
Had this loads of times on new builds too where the electricians don't have a clue with boilers!

 

[Rma72]

This is is a new house that we have purchased (about 5 years old) it used to go off and all of a sudden has started to behave like this.

Where abouts are you based - I am looking for somebody to come and have a look who has a clue.