Downstairs rads taking ages to heat

[Frosty7]

Hi there I’m brand new to this forum and really need some help.
my downstairs radiators can take an age to heat up. Sometimes they just don’t heat up at all. Other times they do heat up and all is good. Until I turn the heating down at night and the issues begins again the next morning. A heating engineer has suggested a power flush. Any help/advice would be really appreciated.

 

[Aquarius]

What type of system do you have? Do you have any motorised valves?

 

[Frosty7]

What type of system do you have? Do you have any motorised valves?

Hi thanks for the reply.
move got the water tank type. Not a combi boiler. Sorry that’s as much as I know about the type of system. I do have a 3 way motorised zonal valve. The pump is definitely running.

 

[Frosty7]

Hi thanks for the reply.
move got the water tank type. Not a combi boiler. Sorry that’s as much as I know about the type of system. I do have a 3 way motorised zonal valve. The pump is definitely running.

What is confusing me is that then downstairs rads do warm up just never as hot as the up stairs ones and it’s a lottery as and when they heat up. As if this moment i have turned the heating off. Opened all rads to fully open. Then turned the heating on. Within minutes the upstair rads are proper hot. Nothing downstairs though

 

[SJB060685]

Could be the system needs balancing and would be my first approach.

 

[Frosty7]

Could be the system needs balancing and would be my first approach.

Ive tried that many times unless I’m doing it wrong. I’ve opened the shield valves half a turn on the upstairs rads. They get roasting. Just now I’m I’ve closed them all up stairs to see if this does anything. Also just tried bleeding the downstairs rads. A steady flow of clean water comes out

 

[SJB060685]

Yes turn off all the upstairs rads and see if that makes a difference.

 

[Frosty7]

Yes turn off all the upstairs rads and see if that makes a difference.

 

[Frosty7]

Right. Just done that. 10 mins ago. Still not heat in the slightest.

 

[Frosty7]

Right. Just done that. 10 mins ago. Still not heat in the slightest.

The pipes going into the pump from the boiler and out the other side of the pump to the radiators at roasting. To hot to touch