Cold radiator

[Carlos_UK]

Morning guys,

I went to my mums yesterday and she commented that the radiator in the hallway was cold, so I offered to have a look.

She has recently had an extension built onto the front of the house with 2 new radiators and a heated towel rail, she originally had a massive double radiator in the hallway, which has been replaced with a smaller one, which is the one that's cold.

She said that the radiator in question worked when it was installed, but since the weathers got colder its stopped, I asked her if the plumber balanced the system and she thinks he did.

As the radiator is in the hallway along with the room stat, it doesn't have a TRV. I made sure it was turned on, and then fully opened the lockshield, still nothing (we believe this is the last radiator on the system) I then turned off the other new radiators and towel rail and the flow pipe got mildly warm but not nowhere near hot, so I went and turned the pump from 2 to 3 and suddenly the rad got hot, so I turned all the others back on and it stayed hot!

So the question is, have I resolved the problem, or is turning up the pump speed just covering up for something else and should she still call back the plumber?

Many thanks,
Carl.

 

[kay-jay]

isnt balanced correctly!
leaving pump on three can be ok depending on how its piped though it could pump over or drag air in. a pump should be set to the lowest setting at which the system works but should ideally not be used to compensate for an unbalanced system

 

[Carlos_UK]

It is an old school gravity hot water, pumped heating system with 9 radiators and a heated towel rail. Would the whole system need to be rebalanced or just the new additions?

 

[IDCHAPPY]

Best to balance the whole thing mate

 

[Carlos_UK]

Ok, thanks guys, I'll tell her to speak to the plumber who installed the new rads