heating fault?

[mickey29]

hi there - just wanted to see if any of you might know what's up with my mum's heating!

not sure what's going on - rads get hot when the HW is on, and if I put CH on, basically i can sometimes hear the pump going, but only some rads get hot - it's an older heating system, (vented?) - about 20 years old. it's a good grundfos pump, and there's a room stat.

i was wondering could it be the 3 port valve? that might be causing the rads to be hot when only HW is on but would it affect the heating working properly too?

cheers in advance for any advice!

Mike 🙂

 

[uug197h]

I think you'v got it right with the 3 port valve sticking try moving the valve by hand to the hw and see how that works its posable it will need changing anyway.