Bucket Test - Boiler running or not

Joined
12 Aug 2011
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Lancashire
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United Kingdom
Hi,
Just a quick question.
I've read the Bucket Test instructions in FAQs, but could I ask please should the system be running or switched off ?

It's a combi boiler and I want to check the return on one radiator.
 
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It's the first one on the system, always been red hot, but recently it just isn't getting hot ( Luke Warm)
There is hot water to the TRV, the TRV is ok, I've checked that it is operating.
The hot water appears to be entering the rad, but the return never gets hot.
I'm therefore assuming that either the rad is blocked or the return pipe, I just want to find out which.
I have Fernox in now overnight and I'm going to flush the whole system as the last rad is slow to heat up, but has got circulation.
 
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How have you checked the trv? Is the lockshield set ok?
Unlikely that the rad is blocked, or that the return pipe is blocked.
 

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