possible blocked coil.

[stecod7]

advice please , going to try and check my cylinder for blockage tomorrow, as im not getting any heat on return to boiler h/w whats best way to unblock and what chemicals are best to degunge coil if it is blocked. thanks from a carpenter come plumber for a day

 

[Alanc]

I would think more likely to be a leaking coil, good luck.

 

[stecod7]

would that lead to discolouration in my domestic water? my taps are all clear ,

 

[Billy Bob Bob]

yes it would,have you drained the system recently ?this could be a airlock very unlikely a inch coil would block,it happens but v rare

 

[Blackcatgas]

yes it would,have you drained the system recently ?this could be a airlock very unlikely a inch coil would block,it happens but v rare

+1 what Mark said.

 

[stevetheplumber]

+1 what Mark said.

more likley to be air especially if they are gravity (ussually 28mmpipe )try cracking the joints on the primaries at the cylinder to let air out or there maybe an air vent on them adjacent to the cylinder

 

[LIFES A GAS]

Is it on gravity or pumped? is there a balancing valve on the cylinder return, if so is it open, have seen a few where they are only just cracked open and then gets blocked with a small amount of sediment,
opening the valve a bit more should flush the sediment away, if you have a fully pumped system is you diverter valve stuck in the heating position, I would not think it's the coil itself blocked as at least a 22mm bore, or would I think coil is leaking unless your expansion tank is overflowing,
Hope this helps, Martin

 

[stecod7]

thanks for reply ,i have posted a new thread regarding my problem , you mentioned about my overflow yes it does overflow . seems to fill tank up from outlet pipe and not expansion pipe. ive checked all possible blockages today and filled up. no overflowing yet but no hw? baffled city @@@@