rads getting warm when hot water only on

[flyingsparks]

hi guys, after the hot water only has been on some of the rads seem to be warm.. the heating zone valve is off (i can manually open it and it springs back to the off position) but the pipe work behind the valve does get warm after 15 mins or so, sao i think the zone valve must be letting some water through. Is it possible to adjust them or do you think i need to put a new one in? (cant remember the make of it at the moment, but its a 2 port one.)thanks Chris

 

[bengasman]

Probably crap in the system stopping the valve from shutting or valve gone.

 

[adlplumbing]

as above

 

[flyingsparks]

the installation is only 2 years old (new build house), how often would you recomend flushing the system, is it worth doing this?

 

[bengasman]

the installation is only 2 years old (new build house),

If it was left with a jar of flux in it, it can go pretty fast

how often would you recomend flushing the system,

Once, provided it is done correctly and maintained afterwares you never nee to do it again.

is it worth doing this?

If the system is full of crap, it's a must.

 

[flyingsparks]

should i use something like x400 and flush that through too for a while and then what kind of inhibitor should be put in after that?

 

[Agile]

Better to use X800 and run foir four hours on low heat.

Then flush out and add X100 inhibitor.

Tony

 

[bengasman]

should i use something like x400 and flush that through too for a while and then what kind of inhibitor should be put in after that?

First you should establish what the actual problem is, not guess and treat one of the options.

 

[flyingsparks]

should i use something like x400 and flush that through too for a while and then what kind of inhibitor should be put in after that?

First you should establish what the actual problem is, not guess and treat one of the options.

So what do you suggest is the best way to confirm where the problem lies?

 

[Agile]

If you dont have the skills yourself then the answer is usually to call a professional !

 

[flyingsparks]

bump

 

[flyingsparks]

If you dont have the skills yourself then the answer is usually to call a professional !

I am very confident and good with jobs like this. I am an electrician by trade but do some plumbing jobs for family and friends.. I know I have the knowledge to drain the system and either fit a new valve or flush it out, but what is the best way to establish if its the valve or just crap in the system? Drain it down and take the valve out anyway for inspection? Thanks for your replys. Much appreciated.

 

[FDJ]

Take the valve apart and have a look at it. Usually, the actuator will come off, then you can remove the rotor part without disconnecting any pipework.
If there has been crap inside, then look for wear or scoring on the rotor.
Check that there isn't a pressure relief valve in the system that could be bypassing the zone valve.
Frank

 

[flyingsparks]

Thank you FDJ, will have a look later.

 

[kevplumb]

If you dont have the skills yourself then the answer is usually to call a professional !

what like you