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Originally Posted by IMM
"The Natural Philosopher" wrote in message
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jason hunter wrote:
Hi, hope someone can help,my girls heating will work upstairs but not
down.These guys have been and all have suggested the pump and some
have replaced it.One has replaced the zone valve,all have suggested
and then dismissed blockage as water does come out of the drain
point.Its quite an old boiler which seems to fire up fine and rads do
get hot.Im sure that when I used Fernox it did help and tried to
balance the rads.Any guidance what I can check to do an in depth
diagnosis and info on balancing properly.The boiler is a wall mounted
type not combi.I can get more system info tomorrow .Thanks Jason
Almost certainly an airlock.
Try over speed on the pump
Try reversing the pump and run for 15 minutes. Then turn it back around.
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Can also try hose pipe from mains pressure tap, piping into the central heating system at each radiator drain (assume you have one). Purge the air out of the pipe first before you connect. This will force water through and up the system, into the F & E header tank, hopefully clearing any air and blockage. By turning on/off the appropriate valve on each end of the Radiator, the water is forced up Flow or Return sections of the pipework.
Be carefull the F & E tank doesn't overflow, and also if you have something like fernox in your system, it may need renewing, due to the fresh water introduced. bear in mind, that if you do have a large amount of sludge in your system, you will be distributing it around.
Either way, it can and does work, just be careful on how you apply the pressure and watch the F & E overflow.