could it be the 3 way valve Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[r1mad]

having trouble getting all radiators hot drained and cleaned system fitted new pump got air out rads

some1 said cold be valve even though had it fitted 6mts since is this possible

[ericmark]

Most valves have a manual leaver to set to a bleed position. Often mid way even with non mid way valves.

[ALDA]

IS SYSTEM SEALED OR OPEN?

IF OPEN, CHECK SYSTEM IS FULLY PRIMED AND NOT DRAWING IN AIR.

YOU SAY YOU DRAINED SYSTEM, CLEANED AND REFILLED.

DID YOU FIND SLUDGE? AND IF SO, DO YOU THINK YOU GOT IT ALL OUT?

YOU MAY HAVE DISLODGED SOME ONLY FOR IT TO BE MOVED ELSEWHERE!

DID YOU BALANCE THE SYSTEM?

ONLY NOW SHOULD YOU CONSIDER VALVE PROBLEM!

IT MAY WELL BE, BUT FIRST THINGS FIRST!