Rads not getting hot!

[Nimit]

Have you checked the pump is def spinning?? Id **** the pump valves, remove the pump head and turn it on, sometimes the impellers can wedge in place, and the pump will still vibrate like it's in action. By removing the pump head you can confirm the pump is def spinning 

I did feel the pump to check if it was spinning and it did feel like it was. Good tip though. I will do that on my next visit there.

 

[Nimit]

do they by any chance have trvs fitted, if your as hot as we were down here,I doubt if the trvs would open !!

No they haven't got any TRV's fitted.

 

[Nimit]

Did you manually open the zone valves before filing

Yeah opened them up.

 

[kris]

Not sure if you said youd done this but id turn off most rads and leave just one on quite near the boiler and switch on heating, measure temperature on flow at boiler and after MV ( just to make sure its opening fully) then check temp at rad, if they are fine then defo air , if not then MV or pump, but make sure boiler is heating the water to appropriate temp,,

 

[Nimit]

Hi all,

Need some more help on this please.

Original issue was resolved. There was an airlock and I got rid of this by back filling via the drain off. Tested the system at the time and everything worked as it should. All rads were getting nice and hot.

Customer has called me this evening as it is now getting colder and said only the upstairs rads are getting hot.

I am going back tomorrow evening to have a look. Any ideas what could be the cause and what I can do to remedy this?

Just to recap it is an open vented s plan system.

Thanks in advance.

 

[Riley]

Did you check the pump?could be a broken impeller or just not turning freely/at all.

 

[jase158]

Pretty sure it is pump, possibly wiring issue!!

 

[Nimit]

Didn't check the pump at the time after as airlock issue was resolved and all rads were getting hot. Guess I should take a spare pump with me and try that.

 

[jase158]

usually is pump as gravity will heat upstairs rads, but not downstairs, unless its air getting in from vent (did u turn pump down after you finished the work?)

 

[Nimit]

Left the pump settings as they were from before.

Thanks for your help btw.