Ufh not getting hot.

[ConnorBennett]

Hello… 

 

so, this used to work but has always been either off and cold or boiling hot. Now it’s just always cold or luke warm. 
 

I’ve flushed, vented and refilled it a few times incase there is air or sludge and neither are precent. I’ve tested the actuators and as you can see they do work fine and open up. I’ve replaced some of the flow meters as they seemed a bit sticky. 
 

the top line (flow) is boiling hot however the return lines are ice cold so that would appear to mean there is no flow. When the mixing valve (white thing?) is turned all the way hot, 0 flow. When I turn it all the way cold it flows perfect and all the pipes cool down in 1 second and the flow meters go all the way to the bottom. 
 

my upstairs is on a similar setup and works perfectly. I can’t understand why this isn’t working. Can any of you see a reason? Any questions please ask.

 

Thanks everyone! 
 

 

[ProDave]

Are the flow and return copper pipes hot?

 

Is the motorised valve opening?

[ConnorBennett]

12 minutes ago, ProDave said:

Are the flow and return copper pipes hot?

 

Is the motorised valve opening?

yes, flow is hot, return is cold.
 

the motorised valve does appear to be opening yes. The one you can switch to auto and open? 

[ProDave]

Can you feel / hear if the pump is running?

[ConnorBennett]

9 minutes ago, ProDave said:

Can you feel / hear if the pump is running?

 
Yes, working fine! Can hear it. Also checked to see if the blade is spinning and it is.